The 9- and 12-Packs of Charmin toilet paper are on sale for $4.99 at Walgreens. Use a $1.00 printable Charmin coupon to pay $3.99. That final price is just $0.03 per square foot!

Use one $1.00/1 Charmin Ultra Soft or Strong Mega Roll 6 ct, Big Roll 9 ct, or Double Roll 12 ct or larger (coupons.com)

Or $1.00/1 Charmin Basic or Essentials Soft or Strong 12 ct or larger (coupons.com)

Final Price: $3.99, or $0.33 per roll, or $0.03 per square foot