When they first come out...and when the newer model comes out. That's about it. Once in a while they will have rebate specials, but that's rare. Your best bet is to just find the best deal right now...you can wait it out, but it'll probably be a while.
Beach isn't a bad store. I've heard good things and bad things, but they aren't a bait and switch type place. check on the Fredmiranda.com sale/trade forums too...sometimes there are great deals to be had on seldom used cameras.
oh and wrong forum.