PriceCharting market prices as of :
| Condition / grade | Price (USD) |
|---|---|
| Ungraded | $2.37 |
| PSA 9 | $4.99 |
| PSA 10 | $20.5 |
| BGS 10 | $27 |
| CGC 10 | $12 |
| SGC 10 | $12 |
Live charts, history, and collection tools: https://tcginsider.net/sets/pokemon-japanese-undone-seal/pokemon-japanese-undone-seal-tentacruel-21