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Amazon [amazon.com] has 80-Oz Liquid-Plumr Pro-Strength Full Clog Destroyer for $7.30 when you check out via Subscribe and Save. Shipping is free w/ Prime or on $35+.

Product Description from Amazon:[list][*]DRAIN CLOG REMOVER: This Liquid-Plumr Pro-Strength Clog Destroyer Gel is fortified with 3X action to protect, prevent and destroy clogs; Packaging may vary[*]WORKS ON MULTIPLE CLOG TYPES: This gel clog remover tackles the toughest clogs from hair (2), grease and soap scum and cuts through standing water to clear total blockages