wait for SEMA 2013!! Then you might have better options to choose.
Or some rich kids get bored and want something new. You can get them used for cheap
Dont buy that word, "holiday special sale". It is marketing gimmick. There is nothing like that unless there is price drop from the manufacturer.
Wheels are not electronics. These vendors are not huge vendors. Most are just drop shippers. I hope you know what I'm saying. They are not cleaning out popular wheels maybe for those non popular ones. They try to get rid them out. Again, they probably only have few sets sitting in the inventory.
You either buy them used or buy new ones when you are ready. I doubt you could find significantly cheaper during Bfday. Good luck.
Yes, lower your car at the same time. It makes huge difference if you want the flush look and no rubbing or poking issues if you are getting aggressive specs.
Last but not least! You will be watching good deals for tires! Yes tirerack and Discounttires might have really good deals on tires during bfday. Tires are expensive... No kidding.