Underground Comix are known for using different prices, covers (art or color variations) and/or interior content to distinguish between printings.
1st print October 1978 has 1.00 USD cover price. All say which printing in indicia information.
2nd print May 1979 has 1.00 USD cover price.
3rd print June 1982 has 1.50 USD cover price.
3rd print is indexed here.
Inside front cover llustration, credits and indicia information.