Amazon offers the Scott Recycled Fiber Toilet Paper 80-Pack for $29.99. Add it to your cart via Subscribe & Save and the price drops to $28.49. With free shipping, that's $0.36/roll and the lowest total price we could find by $26. Each roll includes 506 sheets of 2-ply toilet paper.
Be sure to cancel your subscription once your order arrives to avoid being billed for subsequent shipments.