What is the Slabline Score?

The Slabline Score is a credit-style 0–1000 protection score for a graded trading-card collection, blended from five weighted factors: Insurance (35%), Concentration (25%), Storage (20%), Liquidity (10%), and Provenance (10%). Higher is better; bands run A (≥880) to F (<400).

How does Slabline value my graded cards?

Each card is valued from recent comparable sales for the exact graded card (by certification number and grade), aggregated across eBay, Heritage, Goldin, and PWCC. More comps yield a tighter, higher-confidence value.

Does Slabline sell insurance?

No. Slabline is software that produces broker-ready insurance schedules and risk reports. It is not an insurer, broker, or appraiser and does not provide insurance, financial, or legal advice.

Which cards and categories does Slabline support?

Graded slabs from PSA, BGS, SGC, and CGC across baseball, basketball, football, soccer, Formula 1 / racing, hockey, Pokémon, and Magic.

How much does Slabline cost?

There is a free Ledger tier for up to 25 cards. Collector is $99/year (or $9.99/month) and removes the card limit for an unlimited collection. Insured is $149/year (or $14.99/month) and adds broker-ready insurance schedules and a weekly intelligence brief. A Vaulted tier adds connected Hobby Smart Case hardware.

What is the Hobby Smart Case?

A connected travel case (Travel 40, 75, and Pro) with per-slot temperature, humidity, light, and tamper monitoring, plus GPS location and a chain-of-custody log — turning storage risk into live, sensor-verified data. Launching Q4 2026.

How much is a PSA 10 2003 Best of Game Rocket's Mewtwo [Winner] #8 worth?

A PSA 10 2003 Best of Game Rocket's Mewtwo [Winner] #8 is worth approximately $6,427, based on recent comparable sales. Card values fluctuate with the market.

What's the difference between a Grade 9 and a Gem Mint 10 Rocket's Mewtwo [Winner]?

For the 2003 Best of Game Rocket's Mewtwo [Winner] #8, a Grade 9 is worth about $1,465 while a Gem Mint 10 is about $6,427 — the grade gap is roughly $4,961.

How does Slabline value the Rocket's Mewtwo [Winner] card?

Slabline values each graded card from recent comparable sales of the exact card and grade, aggregated across eBay, Heritage, Goldin, and PWCC. More sales yield a tighter, higher-confidence estimate.

How much is a raw (ungraded) 2003 Best of Game Rocket's Mewtwo [Winner] #8 worth?

A raw (ungraded) 2003 Best of Game Rocket's Mewtwo [Winner] #8 is worth about $630, based on recent comparable sales. Values move with the market — track it free in Slabline to see the current number.

How much is a PSA 7 2003 Best of Game Rocket's Mewtwo [Winner] #8 worth?

A PSA 7 2003 Best of Game Rocket's Mewtwo [Winner] #8 is worth about $735, based on recent comparable sales. Values move with the market — track it free in Slabline to see the current number.

How much is a PSA 8 2003 Best of Game Rocket's Mewtwo [Winner] #8 worth?

A PSA 8 2003 Best of Game Rocket's Mewtwo [Winner] #8 is worth about $947, based on recent comparable sales. Values move with the market — track it free in Slabline to see the current number.

How much is a PSA 9 2003 Best of Game Rocket's Mewtwo [Winner] #8 worth?

A PSA 9 2003 Best of Game Rocket's Mewtwo [Winner] #8 is worth about $1,465, based on recent comparable sales. Values move with the market — track it free in Slabline to see the current number.

How much is a PSA 9.5 2003 Best of Game Rocket's Mewtwo [Winner] #8 worth?

A PSA 9.5 2003 Best of Game Rocket's Mewtwo [Winner] #8 is worth about $1,612, based on recent comparable sales. Values move with the market — track it free in Slabline to see the current number.

How much is a PSA 10 2003 Best of Game Rocket's Mewtwo [Winner] #8 worth?

A PSA 10 2003 Best of Game Rocket's Mewtwo [Winner] #8 is worth about $6,427, based on recent comparable sales. Values move with the market — track it free in Slabline to see the current number.

Slabline^™All graded cards →

2003 Best of Game Rocket's Mewtwo [Winner] #8

Q: How does Slabline value my graded cards?

Each card is valued from recent comparable sales for the exact graded card (by certification number and grade), aggregated across eBay, Heritage, Goldin, and PWCC. More comps yield a tighter, higher-confidence value.

Q: Does Slabline sell insurance?

No. Slabline is software that produces broker-ready insurance schedules and risk reports. It is not an insurer, broker, or appraiser and does not provide insurance, financial, or legal advice.

Q: Which cards and categories does Slabline support?

Graded slabs from PSA, BGS, SGC, and CGC across baseball, basketball, football, soccer, Formula 1 / racing, hockey, Pokémon, and Magic.

Q: How much does Slabline cost?

There is a free Ledger tier for up to 25 cards. Collector is $99/year (or $9.99/month) and removes the card limit for an unlimited collection. Insured is $149/year (or $14.99/month) and adds broker-ready insurance schedules and a weekly intelligence brief. A Vaulted tier adds connected Hobby Smart Case hardware.

Q: What is the Hobby Smart Case?

A connected travel case (Travel 40, 75, and Pro) with per-slot temperature, humidity, light, and tamper monitoring, plus GPS location and a chain-of-custody log — turning storage risk into live, sensor-verified data. Launching Q4 2026.

What a PSA 10 is worth — from real comparable sales.

2003 Best of Game checklist→Pokémon market index-7.6% 1W

Estimated value · PSA 10

$6,427

Based on 148 recent sales of this card at PSA 10, aggregated across marketplaces — live listings below.

Tracked history · PSA 10

Current value

$6,427

Sales, past year (all grades)

148

You own a $6,427 card. A standard homeowners policy typically pays a few hundred dollars for stolen collectibles — and nothing at all for flood.

See what you'd actually get back →

Prefilled with $6,427 · 20 seconds · no account

✦ I own this one

My copy isworth about $6,427

Adds it to a collection on this device — free, no account, values tracked from today.

Add to my collection →

Trading this card? Check the trade → · Ripping slab packs? See the real EV → · both sides priced per cert, liquidity-adjusted, free.

🔔 Want to know when this card moves?

We'll email you when the value changes. No account needed.

One email when it moves ~5%+. Unsubscribe anytime.

Value by grade

How much the 2003 Best of Game Rocket's Mewtwo [Winner] #8 is worth at each grade.

Grade	Value
Raw / Ungraded	$630
Grade 7	$735
Grade 8	$947
Grade 9	$1,465
Grade 9.5	$1,612
Gem Mint 10	$6,427

Own this card? List it on ebay straight from your Slabline collection — prefilled title, photo and price, one tap.→

If you had to sell today

Liquidity

Market value

$6,427

→

Quick-sale recovery

≈ $3,856

60% recovered

A dealer typically pays about 60% of market for a fast, guaranteed sale — the rest is the liquidity gap. An auction or private sale can recover more but takes time and fees. It’s why your Slabline Score weighs liquidity — and why insuring at market matters: a fire-sale recovers far less than the number you’re covered for.

Estimated from dealer buy-vs-sell spreads; actual offers vary by condition and demand.

Have a raw one? See if it's worth grading

Opens the ROI calculator pre-filled with this card's Grade 9 and Gem Mint 10 values.

→

✦ Have the raw card? Pre-Grade it from a photoFree AI

Predict the grade it would likely receive — then see its real gem rate and whether it's worth grading, before you pay to submit.

→

Centering analyzer →

Own this card? Track its value automatically.

Add it to your free Slabline collection — live valuations, a 0–1000 protection score, and a broker-ready insurance schedule.

Start my collection →

See a full Pokémon collection scored →

Or get the iOS app

See live listings on eBay →

Slabline may earn a commission from eBay purchases.

Frequently asked

How much is a PSA 10 2003 Best of Game Rocket's Mewtwo [Winner] #8 worth?: A PSA 10 2003 Best of Game Rocket's Mewtwo [Winner] #8 is worth approximately $6,427, based on recent comparable sales. Card values fluctuate with the market.
What's the difference between a Grade 9 and a Gem Mint 10 Rocket's Mewtwo [Winner]?: For the 2003 Best of Game Rocket's Mewtwo [Winner] #8, a Grade 9 is worth about $1,465 while a Gem Mint 10 is about $6,427 — the grade gap is roughly $4,961.
How does Slabline value the Rocket's Mewtwo [Winner] card?: Slabline values each graded card from recent comparable sales of the exact card and grade, aggregated across eBay, Heritage, Goldin, and PWCC. More sales yield a tighter, higher-confidence estimate.
How much is a raw (ungraded) 2003 Best of Game Rocket's Mewtwo [Winner] #8 worth?: A raw (ungraded) 2003 Best of Game Rocket's Mewtwo [Winner] #8 is worth about $630, based on recent comparable sales. Values move with the market — track it free in Slabline to see the current number.
How much is a PSA 7 2003 Best of Game Rocket's Mewtwo [Winner] #8 worth?: A PSA 7 2003 Best of Game Rocket's Mewtwo [Winner] #8 is worth about $735, based on recent comparable sales. Values move with the market — track it free in Slabline to see the current number.
How much is a PSA 8 2003 Best of Game Rocket's Mewtwo [Winner] #8 worth?: A PSA 8 2003 Best of Game Rocket's Mewtwo [Winner] #8 is worth about $947, based on recent comparable sales. Values move with the market — track it free in Slabline to see the current number.
How much is a PSA 9 2003 Best of Game Rocket's Mewtwo [Winner] #8 worth?: A PSA 9 2003 Best of Game Rocket's Mewtwo [Winner] #8 is worth about $1,465, based on recent comparable sales. Values move with the market — track it free in Slabline to see the current number.
How much is a PSA 9.5 2003 Best of Game Rocket's Mewtwo [Winner] #8 worth?: A PSA 9.5 2003 Best of Game Rocket's Mewtwo [Winner] #8 is worth about $1,612, based on recent comparable sales. Values move with the market — track it free in Slabline to see the current number.
How much is a PSA 10 2003 Best of Game Rocket's Mewtwo [Winner] #8 worth?: A PSA 10 2003 Best of Game Rocket's Mewtwo [Winner] #8 is worth about $6,427, based on recent comparable sales. Values move with the market — track it free in Slabline to see the current number.
How much would I actually get selling the 2003 Best of Game Rocket's Mewtwo [Winner] #8?: A quick sale to a dealer typically recovers about 60% of market value — roughly $3,856 on this card's $6,427 value. An auction or private sale can recover more but takes longer and charges fees. The gap between market value and quick-sale recovery is the card's liquidity risk.

Related cards

Guides

Own this card? Track its value automatically.

Add it to your free Slabline collection — live valuations, a 0–1000 protection score, and a broker-ready insurance schedule.

Start my collection →

See a full Pokémon collection scored →

Values are informational estimates built from recent comparable sales — not a certified appraisal, insurance, or financial advice. Card values fluctuate; figures are a snapshot and may differ from a realized sale.