With orders of $25 or more, Amazon offers Prime members the Scott Choose-A-Size Paper Towels 1-Ply 6-Pack, model no. 16447, for $3.99 with free shipping. (Non-members can spend $35 or more to qualify for free shipping.) That's at least $3 less than you'd spend at a local retail store. Each roll contains 102 11" x 7.3" sheets.
Note that this item is part of Amazon's "add-on" program and can only be purchased with an order of $25 or more.