Balsa Wood, Inc. - Good, inexpensive supplier
 

I needed balsa for a short kit, and after checking BUSA, Midwest, National and the others I went with Balsa Wood, Inc. I was very pleased with the wood, they were far cheaper than anyone else, delivered my order very quickly, and wrapped/sorted the balsa well. Their balsa section was good, but I have a few oddball pieces I'll need to outsource. At any rate, I'm happy with the company and will definitely use them again.

Balsa Wood - Balsa Wood Products, Birch Plywood and Lite Plywood.