if you want a good all around site to buy stuff, go to sounddomain.com. Their prices are cheaper than most and they have a great selection. I have ordered many things from there like my amp and my box. Anyways, the prices their are a hell of a lot better than what you will pay at a retail store like best buy. But, if you EXTREMEMLY low prices, go to http://www.ikesound.com. They have a pretty descent selection of stuff and their prices are insanely low! Also, the best thing is that they have free shipping. Shipping on boxes and subs can be over 20 dollars (i paid 30 on shipping for my dual 12" box). Also, i was curious about the really low prices, and i emailed them to see if anything was factory refurb. They said that everything except the infinity amplifiers were absolutly new just as if you would have bought them in a store. So, if ikesound has the stuff you want, defintily order from them.
Check out my system at http://www.sounddomain.com/id/crzybob77