Cottonelle toilet paper 12-packs are on sale for $3.99 at Walgreens. Use a $0.50 printable coupon at checkout. Pay $3.49, or just $0.02 per square foot!

Use one $0.50/1Cottonelle Toilet Paper 6 ct or larger (coupons.com)

Final Price: $3.49, or $0.29 per roll, or $0.02 per square foot

Related: How to Never Pay Full Price for Toilet Paper Again