You won't.
I remember when everyone was going ape**** over the TF 2011 Begins Batman. "Oh no, it's gonna sell out in minutes!" Hell, people even exchanged their sideshow passwords so they could secure one (Skiman did mine while I was at work
). What ended up happening? Minutes turned into hours, hours turned into days. **** didn't sell out quick at all.
Same deal with Scarecrow and Demon Bats, there were so many opportunities to snag a set it wasn't even funny. Even Sideshow got a refresh batch late in the game.