Graded Market · 10 completed sales
Professor Elm's Training Method graded prices.
As of August 21, 2026, Professor Elm's Training Method (Expedition Base Set #148) in PSA 10 sells for a median of $42.50, based on 10 real eBay completed sales; the raw copy’s reference price is $2.35 — a 18.1× grading premium at the top grade.
Across Expedition Base Set, PSA 10 copies sell for 27.3× their raw reference price on average (56 cards, 339 PSA 10 completed sales tracked).
PSA · Professor Elm's Training Method
| Grade | Median | Sales | vs Raw |
|---|---|---|---|
| Gem Mint 10 | $42.50 | 5 | 18.1× |
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.