There was a LOT of TAC for sale about a month ago.
This stuff is not like toilet paper, where you can pretty much count on it being there when you feel like going to the store. Reloaders need to remember that powders and bullets are done in seasonal runs. Buy enough of it when it comes available, and buy it when you don't immediately need it. Lay in enough stock to last you for three years of whatever it is that is your preferred shooting hobby.