When I built mine I think I had about $80 worth (and that's up here in the land of higher prices and taxation). I'm sure if you look around you could probably get it cheaper from a US vendor. Theses guys were recommended to me so maybe check them out Bristol Valley Hardwoods . I think I paid around $5 a piece for 2' x 1/4" planks 3 and 4" widths from Langevin Forest. pretty cheap stuff