Xanax is made by Pfizer, I have checked their pipeline there is no 3mg Xanax in development, afaict. Maybe you're thinking of
Xanax XR? Xanax XR is avail in a 3mg dose, but it's not new.
To answer your question, the normal route, by doctor's prescription filled at your local pharmacy, it should run you about $200/30 cash price for the 3mg XR's.