Spacers at the same time if you are running stock wheels... otherwise you will be severely disappointed in how sucked in your stockies look.
Also, front camber bolts and adjustable rear lower control arms are good ideas if you want to keep your tires from wearing prematurely. If you are only doing a 1"-ish drop it isn't as important, but more than a 1" drop and you might want to have us install those at the same time that we lower it.
As far as springs... I have a number of them in stock here, but I sold my set of RCEs so if you want those you will have to order them.
http://portland.craigslist.org/mlt/pts/4929172997.html