SurfaceCo - Interlocking Stall Mats 3/4" – The Treadmill Factory
Amazon.com: American Floor Mats - Horse/Stable Mats - Heavy Duty Stall Mats - Thick, Durable Rubber Flooring Solid Black 1/2" Thick - 4' x 6' Mat : Pet Supplies
$29.99 Rubber Floor Mats 4' x 6' x 3/4" - Second Quality - Cashmans
3 ft. x 4 ft. Utility Rubber Stall Mat, Black at Tractor Supply Co.