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.
The Print Mint-
1st print has 1.00 USD cover.
The Print Mint & Last Gasp-
2nd print has 1.50 USD cover
3rd print has 2.50 USD cover. 4th print has 2.95 USD cover. 5th print has 4.95 cover.
This issue has variants: