Some of the exotic woods can get pricey.I am fortunate to have a local shop that does custom trim/cabinet work and they stock several exotics as well as domestics. They sell as much or as little as I need. As long as they can still use or resell the board.
Woodcraft sells smaller pieces, but sometimes cost more than buying longer lenghts. They will cut off pieces (atleast the local one will) as long as it leaves a good sized pieces( 4 foot +) to sell.
Check your area for local cabinet shops, woodworking shops you might be able to get their scraps cheap or even free. I don't buy scraps, but when my scrap bin gets to full I usually box it up and give it to someone. I just ask them to pay shipping.