Where do these graded prices come from?

Medians of 40 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 Nidoking (H18) worth it?

Compare the graded medians below against the raw reference price of $230.98 and subtract grading fees. The CardIntel Grading ROI calculator runs this math with live numbers.

Graded Market · 40 completed sales

Nidoking (H18) graded prices.

As of August 20, 2026, Nidoking (H18) (Aquapolis #H18) trades across the graded ladder below, based on 40 real eBay completed sales; the raw copy’s reference price is $230.98.

Across Aquapolis, PSA 10 copies sell for 27.6× their raw reference price on average (40 cards, 201 PSA 10 completed sales tracked).

As of August 20, 2026Raw price & chart →Grading ROI calculator →

PSA · Nidoking (H18)

Grade	Median	Sales	vs Raw
Mint 9	$475.04	12	2.1×
NM-MT 8	$355.00	8	1.5×
EX 5	$150.00	3	0.6×

CGC · Nidoking (H18)

Grade	Median	Sales	vs Raw
Mint 9	$299.00	5	1.3×

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.