Balsa Source

I am looking for balsa or similar very light wood in 2 in. x 2 in. profile, length not critical. I need about 6 meters. This dimension is larger than the hobby shops and stationary supply stores carry, at least the ones I have visited. I have sen an outfit called Benton Jones listed as a supplier of balsa in Thailand, but the phone number is dead. Thanks in advance to anyone who can provide any leads on a wholesaler or retailer who might have balsa or similar light wood in larger sizes.