Question
Where can I find a Catalba tree. they are grown for the worms as fishing bait

Answer
You could try your local nursery or here is a web link to a couple of nurseries that sell them.

http://www.tytyga.com/product/Catalpa+Tree

http://static.naturehills.com/northerncatalpa/index.html

http://forums.gardenweb.com/forums/load/carolgard/msg0514534310576.html