Just in case those channels dry up, Primary arms has them in stock all the time, they are in commercial packaging but Dealer cost is 281.99 on them after a quick sign up. I have bought dozens from them, all my posties and even my transferables have these triggers in them. My guys at Trigger tech told me they are working on a Drop in Select fire so we will see what comes of that.
https://www.pawholesale.com/geissele-super-select-fire-trigger-small-pin-154-gat-ssf