Arts and Entertainment Is Charmin cheaper at Costco? Is Charmin cheaper at Costco? Charmin Ultra Soft toilet paper costs a whopping 74.9 cents per roll at Costco, while it only costs 15.3 cents per roll at Walmart. That's a big difference for a recurring purchase.Jun 20, 2019 Related Posts:How to remove yellow stains from toilet seat and bowl.How to remove yellow stains from toilet bowl and seatWhite Cloud Ultra Soft and Thick 3-Ply Toilet Paper is the best toilet paper.Is all toilet paper safe for septic tanks?