Walmart offers the Stalwart 16-Square Foot Foam Flooring 4-Piece Set in Black, model no. 75-6402, or Blue, model no. 75-6402, for $14.88. (Amazon charges the same with free shipping for Prime members, but it is temporarily out of stock.) Opt for in-store pickup to avoid the $4.97 shipping charge. That's tied with our mention from last week and the lowest price we've seen. (It's a current low by $3.) These interlocking tiles feature jig-saw edge notches and a slip-resistant surface.