THE CONTRACTOR’S HEADQUARTERS Prairie Supply inc. is a supplier of construction equipment and materials. We specialize in, but are not limited to concrete construction. For more than 20 years Prairie Supply has serviced the Dakotas and beyond as a reliable customer service oriented supplier in construction and building materials. Prairie has been a part of some of the biggest projects in the region, lending knowledge and support to the hardworking contractors in the field or at the drawing board.