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GORILLA COMMERCE via Amazon [amazon.com] has 17.5″ x 11″ GORILLA GRIP Extra Thick 1.3″ Soft Foam Kneeling Pad for $12.99.
Shipping is free with Prime or on $35+ orders.

GORILLA COMMERCE via Walmart [walmart.com] also has 17.5″ x 11″ GORILLA GRIP Extra Thick 1.3″ Soft Foam Kneeling Pad (Black) for $12.99. Shipping is free w/ Walmart+ ($1 trial available [walmart.com]) or on orders of $35+.