Walmart has the 6-Piece BalanceFrom 24 Sq. Ft. 1/2" Thick Interlocking Puzzle Exercise Mat (Black; BFWE-1BLK) for $19 with free shipping with Walmart+ (free 30-day trial), $6 shipping, or free shipping on $35+.

Includes six 24" L x 24" W x 1/2" H tiles and 12 border edges.

24-pc 24 sq. ft. 1" Thick Interlocking Puzzle Exercise Mat, Black for $39 or Blue for $38