The on-sale date is the publication date reported in U. S. Copyright Office filings.
Early printings by Print Mint. Later printings by Last Gasp.
Underground Comix are known for using different prices, covers (art or color variations) and/or interior content to distinguish between printings.
1st print has 0.50 USD cover. 2nd print has 0.75 USD cover. 3rd print has 1.00 USD cover.
4th print has 2.50 USD cover (published by Last Gasp). 5th print has 2.95 USD cover.
This issue has variants: