Woot offers Sivan Health and Fitness Mat-Lock Interlocking Foam Puzzle Exercise Mat 6-Pack Set for $19.99 (orig. $49.99). Free shipping for Prime Members.

Product Description:
Perfect for exercise, gymnastics, yoga, Crossfit, Pilates, MMA, children play areas, daycares, workshops, fitness rooms, camping and poolside areas. Protects both your floor and your exercise equipment, or works just as well as a play mat. They can be assembled in minutes. The double-sided gripped surface will make it grip to the floor or carpet to prevent injuries, and will protect your floors while providing a comfortable workout area.  Made from Premium non-toxic durable EVA Foam.

• Includes 6 tiles and 12 border edge ends
• Each tile measures 24" x 24" x 1/2", covers 24 square feet total
• Made out of high density Premium non-toxic EVA foam for the greatest durability and comfort
• Double-sided gripped surface will make it grip to the floor or carpet to prevent injuries
• Protect your floors while providing a comfortable workout area
• Use under heavy exercise machines to dampens vibration reduce equipment noise and protect your floor or carpet
• Can also be used as an anti-fatigue play mat for playrooms and daycares
• Lightweight and easy to assemble
• Water, mold and mildew resistant - makes it easy to clean!
• Imported