Once again, Nelson hobbies in Keller, TX now has a good supply of balsa. He advertises in Flying Models so you can find his contact info there. I have seen the wood, it is fine quality and I will gladly use it for stunt ships. It is graded by weight down to 6# which can be anything below 7#. Prices are OK, certainly less than buying from a local hobby shop.
As for carbon tubing, you might try calling Mike's Hobby Shop in Carrolton, TX, I know they have carbon tubing in stock.
Don