Amazon.com : Concept 2 Rower Mat for Model D Concept2 Rowing Machine - Anti Slip and High Density - Concept 2 Rowing Machine Fit - Concept 2 Rower Accessories (Concept 2 Model D) : Sports & Outdoors
Rubber-Cal Rubber 4-ft x 6-1/2-ft Equipment Mat in the Exercise Equipment Mats department at Lowes.com
Amazon.com: Extra Long Non-Slip Exercise Mat - 8.5 Feet, Black, Waterproof, Large Mat for Use Under Treadmill or Rowing Machine, Gym and Fitness Equipment, Dual Pad, Carpet (with Gippers) : Sports &
Cardio Machine Floor Mats - Bells Of Steel USA
MotionTex Exercise Equipment Mat for Under Treadmill, Rowing Machine, Elliptical, Fitness Equipment, Home Gym Floor Protection, 30" x 66", Black (8M-110-30C-5.5) - Walmart.com