Lately i've been useing old barn boards that a freind of mine supplies me with. Red Oak ,Walnut, Chestnut, cedar ,pine and in widths you just can't buy, some as wide as 24". If someone local tears down barns in your area make freinds with them . you'll need a good planer or wide drum sander but there is some amazing wood out there on barns. Most of it is free and free is my favorite kind of wood.
sully