PriceCharting market prices as of :
| Condition / grade | Price (USD) |
|---|---|
| Ungraded | $1.48 |
| PSA 9 | $10.81 |
| PSA 10 | $28.99 |
| BGS 10 | $38 |
| CGC 10 | $10 |
| SGC 10 | $17 |
Market context: ungraded price -6.9% over 30 days. +8.0% over 90 days. PSA 10 premium: 19.6× ungraded.
Live charts, history, and collection tools: https://tcginsider.net/sets/pokemon-japanese-terastal-festival/pokemon-japanese-terastal-festival-cornerstone-mask-ogerpon-ex-91