Discount Lumber & Metal Roofing. Located at 2660 East Main, Grand Junction. We offer the lowest price on premium metal roofing. Precuts on hand in selected colors and finishes. Discount Lumber & Metal Roofing makes sure that the public gets contractors prices. You will find the best prices on Wafer Board, Lumber, Shingles, Siding, Trusses, I-Joice, R.R. Ties and Fencing.