PriceCharting market prices as of :
| Condition / grade | Price (USD) |
|---|---|
| Ungraded | $3.43 |
| PSA 9 | $42.56 |
| PSA 10 | $128.25 |
| BGS 10 | $167 |
| CGC 10 | $77 |
| SGC 10 | $77 |
Live charts, history, and collection tools: https://tcginsider.net/sets/pokemon-japanese-holon-research/pokemon-japanese-holon-research-koffing-5