Where do these graded prices come from?

Medians of 12 real eBay completed sales aggregated per grade (PSA, BGS, CGC) — a completed-sale evidence layer, not listing asks. Sample sizes are shown per grade; thin grades deserve caution.

Is grading Gyarados - 34/108 (Prerelease) [Staff] worth it?

Compare the graded medians below against the raw reference price of $549.98 and subtract grading fees. The CardIntel Grading ROI calculator runs this math with live numbers.

Graded Market · 12 completed sales

Gyarados - 34/108 (Prerelease) [Staff] graded prices.

As of August 21, 2026, Gyarados - 34/108 (Prerelease) [Staff] (XY Black Star Promos #34) trades across the graded ladder below, based on 12 real eBay completed sales; the raw copy’s reference price is $549.98.

Across XY Black Star Promos, PSA 10 copies sell for 60.0× their raw reference price on average (52 cards, 912 PSA 10 completed sales tracked).

As of August 21, 2026Raw price & chart →Grading ROI calculator →

PSA · Gyarados - 34/108 (Prerelease) [Staff]

Grade	Median	Sales	vs Raw
Mint 9	$228.24	3	0.4×
NM-MT 8	$750.75	3	1.4×

Medians of real eBay completed sales per grade; small sample sizes deserve caution. Prices are dated reference values — cite them with the as-of date above. Attribution: CardIntel (cardintel.io). See the methodology.