Underground Comix are known for using different prices, covers (art or color variations) and interior content to distinguish different printings.
1st print December 1977 (actually January 1978) has 1.00 USD cover price.
2nd print has 1.25 USD cover price.
This issue is a variant of
Dirty Laundry Comics (Last Gasp, 1977 series) #[2] [First Printing $1.00].