Where do these graded prices come from?

Medians of 7 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 Underground Lake worth it?

Compare the graded medians below against the raw reference price of $10.22 and subtract grading fees. The CardIntel Grading ROI calculator runs this math with live numbers.

Graded Market · 7 completed sales

Underground Lake graded prices.

As of August 2, 2026, Underground Lake (Skyridge #141) trades across the graded ladder below, based on 7 real eBay completed sales; the raw copy’s reference price is $10.22.

Across Skyridge, PSA 10 copies sell for 12.5× their raw reference price on average (61 cards, 392 PSA 10 completed sales tracked).

As of August 2, 2026Raw price & chart →Grading ROI calculator →

PSA · Underground Lake

Grade	Median	Sales	vs Raw
Mint 9	$47.50	3	4.6×

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.