Stock as in what the retailers have in stock.
Bullets are in stock, (check X-Treme and Berry's among others), I just took delivery of 260# so I'm set there. And you can find primers, though not many retailers have them, MidSouth seems to have CCI and Cabela's has Federal, so I've order a few.
But powder? I've only found a small local store in Houston, Lohman's Arms, that has Power Pistol. And of course it's little more costly than a year ago. Most of the normal on-line retailers are out of practically everything. Most of them even have a "filter" (in stock only) to help you shorten your search. Using that filter Sinclair Int has only 18 sku's out of all the powders. To give you and idea of scope, Alliant has over 60 sku's alone, all out of stock.