You might be surprised what you can find on eBay. There are many hard and soft "exotic" woods available in various board dimensions, from high feedback rated suppliers.
I had one supplier cut to dimension solid 3/4" walnut and cherry boards with 45 degree vertical cut ends, ala the Bottlehead alder bases, cutting my own top plate recess as needed. The cuts were extremely accurate with fine, smooth edges, and I felt at reasonable cost, even with shipping.