We had a few people send this little tidbit of information over to us, but couldn't be completely sure. It's an extremely rare occurrence, but some Hot Topic locations have a couple of these in stock already. Your best bet is to give them a call, or stop by on your way home from work/soccer practice/knitting lessons.
Our media guy, Xyro, also talked to someone from corporate about it. Apparently they were about 56 Derpy's over ordered on their website right now. Someone "derped" and accidently re-opened it. Rainbow Dash on the other hand should still be available.
Thanks to Cyberdashie for the images above and everyone else for submitting their store receipts and stuff!