Home Depot has Rubber-Cal Shark Tooth 3/4″ Thick Heavy Duty Black Rubber Flooring Mat (48″ x 36″) on sale for $37.38. Shipping is free.

Product Details:

• Covers 12 sq. ft
• Heavy duty mats with high contents of EPDM resists UV/ozone; perfect for protective flooring for outdoor or indoor spaces
• Protect subsurface floors from damage due to heavy machinery or furniture
• Made from 100% tire crumb, this recycled mat is as durable and weather resistant as the tires they are molded from
• Thick cushion provides excellent anti-slip and anti-fatigue rubber tile, creating a safe and comfortable environment for the home or office
• At a 3/4-inch thickness, this thick rubber tile reduces noise, contains vibration, and absorbs shock
• Easily cleaned using everyday, household cleaning solutions
• Shark Tooth mat is best used as a covering for a fraction of a room's floors, rather than as an all-encompassing surface
• Mats weigh ~ 50 lbs