PriceCharting market prices as of :
| Condition / grade | Price (USD) |
|---|---|
| Ungraded | $11.93 |
| PSA 7 | $51 |
| PSA 8 | $64.99 |
| PSA 9 | $110.7 |
| PSA 10 | $628.47 |
| BGS 10 | $817 |
| CGC 10 | $228.5 |
| SGC 10 | $377 |
Live charts, history, and collection tools: https://tcginsider.net/sets/pokemon-japanese-expansion-pack/pokemon-japanese-expansion-pack-koffing-no-rarity-109