With orders of $25 or more, Amazon offers Prime members the Cottonelle Ultra ComfortCare Toilet Paper 12-Pack for $3.99 with free shipping. (Non-members can spend $35 to bag free shipping.) That's just 33 cents/roll and about $4 under what you'd pay for a similar quantity in-store locally. Each roll contains 126 sheets.

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Note that this item is offered as part of Amazon's "add-on program" and can only be purchased with an order of $25 or more.