I have switched to BE-86 from both Unique and Universal.
BE-86 is good stuff. Haven't used it in 45 ACP, but it shoots well in my 45 Colt and 32 H&R Mag. It's been pretty readily available, too. Get similar velocities to Unique, but it seems a little cleaner.
As to the OP, Midway and PV have both had Bullseye and Unique in stock fairly recently. Alliant powders in general sell out really fast, though. Not sure if that is from the supply side, demand side, or a combination of both.
I've become very fond of CFE Pistol over this past year. It's shot very well with just about every bullet/cartridge combination I've tried it with, it burns really clean, and it's relatively cheap by today's standards. An 8 pounder will set you back $200-ish. It's also pretty much constantly in stock at most online stores these days.
