PriceCharting market prices as of :
| Condition / grade | Price (USD) |
|---|---|
| Ungraded | $1.9 |
| PSA 8 | $10.95 |
| PSA 9 | $23.25 |
| PSA 10 | $69 |
| BGS 10 | $90 |
| CGC 10 | $41 |
| SGC 10 | $41 |
Live charts, history, and collection tools: https://tcginsider.net/sets/pokemon-japanese-challenge-from-the-darkness/pokemon-japanese-challenge-from-the-darkness-koga-s-ekans-23