Like the hippie said try the wood from pallets, some of the eastern companies use oak for pallets and for dunage between pipes. You could also get wood from pieces of OLD DAMAGED OR BROKEN FURNITURE. Also in B.C. , WINSOR PLYWOOD STORES sometimes have pieces of exotic woods. But do a Internet check on the different woods that you plan to use as the DUST from some of the EXOTIC WOODS can cause lung problems or just be plain poisonous if breathed. Hardwoods are usually used , Maple, Oak, Mahogany, Walnut,and some fruit trees ( but they need to be dried or seasoned) are fairly easy to get, you only need a small piece. If you get a thick piece and cut it down the middle you will have the same grain on each side, this is not too big a problem if you are going to checker the grips but if you are making smooth grips you may want them to be the same or matching. Pieces off of Moose, elk and large deer antlers are also a source of grip material.