With orders of $25 or more, Amazon offers its Prime members the Altra or SystemBuild Fabric Storage Bin in five colors (Mocha pictured) for $6.18 with free shipping. (Non-members can spend $35 or more to qualify for free shipping; otherwise, it costs an extra $9.82.) That's the lowest total price we could find by $3. These bins are designed to fold when not in use and measure 11" x 11" x 11".

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