Stalwart Adjustable Sized Telescopic Furniture Dolly Roller for $18.99. Order online for in-store pickup at Staples to lock in the price and save on shipping. Otherwise, shipping is free with free Staples Rewards membership. Here is a screenshot for reference. The dolly roller has rubber wheels, stainless steel poles, PVC corner, and measures 21″ to 31″W x 21″ to 31″D x 3.75″H.