Big retaining wall blocks can be found at several hardware stores, including Lowe's, Home Depot and Menard's. In addition, there are websites, such as bigblockinc.com or reconwalls.com, that can direct a customer to a retailer selling the products they manufacture.
The purpose of a retaining wall is to hold, or at least retain, soil. In addition to blocks, some retaining walls are made with poured concrete, rocks or boulders. The biggest blocks generally range between 60-72 inches, and weigh up to 3,900 pounds. Furthermore, for aesthetic appeal, the blocks are able to be color-stained, whether it be a simple grey color, or even a reddish brown.