1x4 (3/4" x 3-1/2") Natural Alder S4S Lumber, Boards, & Flat Stock from Baird Brothers
1 x 4 Poplar Wood V-Groove – Advantage Lumber
1x4 - 10 Ft. Premium Allwood Pine Board | Dealer Pack 800 board feet
1 in. x 4 in. x 6 ft. Common Board 914673 - The Home Depot
Severe Weather 1-in x 4-in x 12-ft Pressure Treated Unfinished #2 Southern Yellow Pine Board in the Appearance Boards department at Lowes.com
1x4 WR Cedar A&Better S1S2E | Capitol City Lumber
Standard Size 1x4 Knotty Maple Boards - $2.36/ft – American Wood Moldings
1 x 4 x 16' #2 White Pine Lumber - Schillings
Severe Weather 1-in x 4-in x 12-ft Appearance Southern Yellow Pine Pressure Treated Lumber in the Pressure Treated Lumber department at Lowes.com
1x4 #2 Yellow Pine Lumber, S4S | Capitol City Lumber
1x4 Cypress, Select S1S2E | Capitol City Lumber
1 in. x 4 in. x 8 ft. Premium Kiln-Dried Square Edge Whitewood Common Board 914681 - The Home Depot
Amazon.com: FLEXTRIM #1X4: Flexible Flatstock Casing: 3/4" Thick x 3-1/2" Wide - PRE Curved to fit Half Round Arches 67" Diameter up to 84" Diameter : Tools & Home Improvement
1x4 KDAT Treated Lumber | Capitol City Lumber | Raleigh