You can get baum* bats in just about any size or configuration for training but they are a little on the expensive side.
here is the link to their site. I have one of their game bats it ran me about $180 including shipping but their fully composite and the only stories ive heard about them breaking is when they were used on pitching machines that were cranked to the top velocity (104mph) in the pros and then hit off the handle in an attempt to break it.
Ive had mine for a year and it hasny come close to breaking. The bat you would be looking for is the Monster training bat