Basic--if it is a "game species" under the purview of TPWD, it can't be sold. Any of the exotics are livestock and can be sold (someone else will have to chime in on any potential technicalities).
There are stores that sell whitetail meat under he guise that it is from out of state. Whether or not this is true I don't know but the processor I use here in town sells some.
Yeah most states from what I understand won't allow you to sell what you hunt, they don't want to encourage commercialization or poaching, as well as make sure food sold to the public meets health standards.
[This message has been edited by Oragator (edited 11/3/2012 2:53a).]