I just needed wood in the back of the Erwhipee truck to keep the rattling down and so I could put something back there. I bought construction lumber pine (had to go through a pile of boards to find good straight ones) and a dado blade. I used some PPG oil based deck treatment on the wood. I can't believe how nice it looks. I spent less than $50 at menards for 1x8's and 1x6's. The dado blade cost more than that.
Pine one-bys.....$50
new metal strips......$70
new carriage bolts from the hardware store with many left over for the next one...$45
I had some construction putty for the wheel wells laying around and some left over primer and paint for the edges.
Total cost was less than $170. My labor was fun and free.