TAC has appeared on several sites this year. I picked up an 8-pounder 2-3 months ago, and saw both 1- and 8-pounders on another site a couple weeks ago, but they disappeared quickly. Am also seeing 1-pounders in local stores frequently.
The factory that makes TAC is only capable of making one of the Ramshot rifle powders at a time, and since last fall they have been producing TAC because it's their most popular powder. Have heard they will be switching to making others fairly soon.