Cottonelle 12-count toilet paper is on sale for $3.99 at Walgreens. Print a $0.50 coupon and pay $0.02 per square foot!

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

Final Price: $3.49, or $0.29 per roll, or $0.02 per sq ft