Two really good sites

[HappyGunner]

http://www.militarywarfighter.com/index.html

I ordered a Trijicon 3.5x35 ACOG Scope (TA11F) from them everyone else were out of stock because this scope is in high demand in Iraq.

http://www.midwestindustriesinc.com/contact.htm
I found really good prices on GI AR Mags both 20rd&30rd.

Here is another quality AR site they have lots of neat stuff.
http://stores.homestead.com/Laruetactical/Detail.bok?no=86