TrafficMaster Black 36 in. x 48 in. Rubber Deck Plate Mat MT1003508 - The Home Depot
Non-Slip Interlocking Safety Matting and Decking - DuraGrid
Amazon.com: smabee Rubber Non-Slip Waterproof Floor Mat Heavy Duty Anti-Fatigue Mats 33"x57" for Wet or Snow Deck, Restaurant Bar Kitchen Yard Boat : Home & Kitchen
Non-Slip Grip Mats at Lowes.com
Performa-SD Solid-Top Rubber Drainage Mat - Raised & Non-Slip