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I did not see this posted, hence posting it here.

Target.com has Liquid-Plumr Pro-Strength Clog Remover Full Clog Destroyer, 160 fl oz [target.com] for $ 12.29

Based on the current promotion buy 1 get 1 50% off select cleaning items [target.com], if you add two
Liquid-Plumr Pro-Strength Clog Remover Full Clog Destroyer, 160 fl oz [target.com] to your cart then your total would be $ 18.44 , which is $ 4.61 per 80z can.