Best prices on Rubbermaid in Chair Mats. Check out BizRate for great deals on Chair Mats from Rubbermaid and United Stationers. Use BizRate's latest online shopping features to compare prices for Rubbermaid. Read product specifications, calculate tax and shipping charges, sort your results, and buy Office Supplies with confidence. Easily narrow your search and find the product that's perfect for you: Rubbermaid 76730 Chair Mat - 46" x 60" in. - Rubbermaid 64483 Diamond "L" Workstation Chair Mat - 60" x 66" in..