I would grab this why you can. Jumbo size cat litter mat. Editors Choice brand on Amazon. $34.95 at Amazon. $8.99 at Walmart.
https://www.walmart.com/ip/Easyol…/268442111
They also have the XL one for the same price. 36" x 24". $17.99 at Amazon. $8.99 at Walmart
https://www.walmart.com/ip/Easyol…/545189305
Amazon links for reference:
Jumbo Mat – https://www.amazon.com/Easyology-…litter+mat
XL Mat – https://www.amazon.com/Easyology-…litter+mat