Underground Comix are known for using different prices, covers (art or color variations) and/or interior content to distinguish between printings. 1st print has 2.95 USD cover. 2nd print has 3.95 USD cover. 3rd print has 4.95 cover.
This issue is a variant of Zap Comix (Last Gasp, 1982 ? series) #13.
There exist further variants:
Trashman; Jesus Christ; Coochy Cooty; Checkered Demon; Wonder Wart-Hog; Beulah; Joe; Big Bitch; Robert Crumb; S. Clay Wilson; Robert Williams; Dinosaur; Potato; Mickey Mouse; Donald Duck; Doctor