Call NEF/H&R ((978) 632-9393) and ask for their parts catalog. Or if you can describe what you want they will take your credit card number right there and ship it to you. If you want pretty, the wood for the Buffalo Classic, checkered and ready to install, will set you back close to $100 for both stock & forearm. You can get the laminated wood for less, or go down to the plain hardwood for around $30 (IIRC) for the butt.
-WH-