Underground Comix are known for using different prices, covers (art or color variations) and/or interior content to distinguish between printings.
The Print Mint-
1st print- 0.50 USD cover. Has heavy stock cover.
2nd print- 0.50 USD cover. Has lighter cover stock, no copyright on inside front cover.
3rd print- 0.50 USD cover. Has 1969 copyright on inside front cover.
4th print- 0.75 USD cover. 5th print- 1.00; 6th print- 2.00
Last Gasp-
7th print- 2.50; 8th print- 2.95
9th print- 3.95 (not listed in Fogel's guide); 10th print- 4.95 USD
This issue has variants: