With orders of $25 or more, Amazon offers the Swiffer Sweeper Dry Sweeping Cloths 37-Pack in Febreeze Lavender and Vanilla Comfort for $4.77. Clip the 40 cents off coupon on the product page to cut it to $4.37. Plus, Prime members receive free shipping. (Non-members can spend $35 or more to qualify for free shipping; otherwise, it starts around $5.) That's $6 under the lowest total price we could find. These dry cleaning cloths are compatible with the Swiffer Sweeper Vac or Swiffer Sweeper.

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