Walmart has 2-Piece Mainstays Medium Woven Felt Basket w/ Faux Leather Handles (Dark Heather Grey or Light Grey, 15" x 11.02" x 7.87") on sale for $6.32 ($3.16 each). Shipping is free w/ Walmart+ ( free trial ) or on orders $35+.
Lots of photos posted by reviewers…these baskets are large enough for a cat.