Red Barn Rubber Gym Mats Pallet Of 25 (seconds quality) | North West Rubber (1202220-SECONDS)
Black Stall Mats 4 x 6 Dome / Flat – Farm and Barn Supply
Costco (in Canada at least) has these sweet rubber mats that remind me of the gym. Way cheaper than Amazon since they are heavy as heck! It's flat on the other side :