You can get 40 ft of 1x1.5 cleats out of a 6" - 8" wide four quarter (1 inch thick) board that is 10 ft long. You're looking at about 5-7 board ft of wood there, so at $5/board-ft, $25-$35 before tax. If you don't have a planer and table saw, most hardwood centers will plane and cut the wood...