Find a company that specializes in woodturning and they will probably sell them. There is a way to get lots of turning blanks for free or cheap, and some of it could be slightly exotic. In your area of Texas there should be several companies that remove problem trees from peoples yards (tree surgeons or tree removal companies). It shouldn't be hard to strike up a deal with one of them. Even if they have markets for the sawlog part of the tree, there is lots of turnable wood that won't make lumber such as large limb crotches and sections between knots.
Someone I consider a master woodworker once told me that a master woodworker is not someone who never makes mistakes. He is someone who is able to cover them up so that no one can tell.