modern-to-grade · holo
Blastoise-GX
SM Black Star Promos · #SM189 · English · released 2017
Raw market price
$21
7 days
▼ 0.2%
30 days
▼ 4.7%
90 days
▼ 9.3%
Graded prices & PSA population
| Grade | Market price | PSA population |
|---|---|---|
| PSA 10 | $437 | 545 |
| PSA 9 | $42 | 1,060 |
| PSA 8 | $28 | 317 |
PSA population recorded 2026-09-05 · total graded 2,122
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
BGS 10
$437
PSA 10
$300
TAG 10
$127
CGC 10
$44
BGS 8
$42
PSA 9
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More from SM Black Star Promos
Market data recorded 2026-07-20 from licensed market sources. MASTER records prices daily and never invents a number — estimated values are always labeled. Not financial advice.