CL and Gear Trade. Thing is if you have a list and know the gear and then keep your eyes open. Recently picked up some slightly used K2 contour boots in my size (retail 285) for 35. There are lots of deals but the hard part as a beginner you don't know the gear. But boots (look at the boot faq sticky in the boot section) first and most important...spare no expense in getting good fitting boots, the bindings that fit your boot and lastly board.
Most sites I use already mentioned, except Trusnow--just ordered some gore tex pants for $100 from them. Got a pretty nice beginner's board and some burton boots for my nephew for a total of $220 shipped @the-house. Definitely try cl for used board and bindings if you're just starting out. Used boots might be kind of nasty, but people do rent all the time so I guess it would not be that bad. I know my new boots have only been used 6 times over the past couple weeks and they are pretty damn stinky already. Example of cl find: I got an almost new set of malavita bindings for $100 on there yesterday.
It is a great time to be in the market for stuff, awesome deals online everywhere. I would support my local shops if they price matched, but I'm not paying full retail or just slightly discounted prices anymore. My local outdoor/camping store does price match and I have bought some stuff there lately.