Underground Comix are known for using different prices, covers (art or color variations) and/or interior content to distinguish between printings.
1st print has 2.00 USD cover price. 1st-3rd printings have color interior pages.
2nd print has 2.25 USD cover price. 3rd print has 2.95 USD cover price.
4th print has 3.25 USD cover price. 5th print has 3.95 USD cover price. Both have black and white interior pages.