modern-to-grade · holo
Blastoise-GX
SM Black Star Promos · #SM189 · English · released 2017
Raw market price
$20.00
7 days
▼ 3.4%
30 days
▲ 1.2%
90 days
▼ 0.6%
Graded prices & PSA population
| Grade | Market price | PSA population |
|---|---|---|
| PSA 10 | $477.00 | 546 |
| PSA 9 | $46.00 | 1,070 |
| PSA 8 | $35.00 | 333 |
PSA population recorded 2026-10-21 · total graded 2,159
Why this card matters
pop
44 listings and modest sample sizes suggest limited but not razor-thin supply; the PSA 10 premium (~40x raw) is striking but driven by a small n=5 comp base, making it fragile.
demand
Blastoise carries strong nostalgia and GX-era collector appeal, but as an Oversized promo it occupies a niche format that limits mainstream demand.
artist
Standard Oversized GX promo illustration with no notable alt-art or standout artist association to drive independent collector desirability.
catalyst
A 9.1% 30-day price move is mildly positive but unreliable as a signal given the thin comp volume across all grades.
Graded comps on record
$550.00
BGS 10
$477.00
PSA 10
$300.00
TAG 10
$211.00
CGC 10
$46.00
PSA 9
$44.00
BGS 8
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More from SM Black Star Promos
Market data recorded 2026-10-02 from licensed market sources. MASTER records prices daily and never invents a number — estimated values are always labeled. Not financial advice.