I'm thinking back to 2008-9. 2008 and before, just go to Powder Valley.com or any other place, load up your shopping cart and it'd be on your porch in a few days. Then ... out of everything but shotgun primers and even out of many powders, brass, and bullets. For a loooong time. I don't think primer availability really got back on track until mid to late 2010.
Maybe buy a couple of stripped AR lowers too. I just took an AR armorer's course and was going to build anyway. Tuck away a few lowers for projects, should always be able to sell them later if the projects don't get built. I remember no black rifles anywhere for many months back in late 2008 also... if you have the cash, buy in case Obama wins re-election. And buy even if he doesn't because as has been pointed out, a lot of people are going to go bananas worrying that he will get re-elected.