I posted in the last AR thread about classicarms.us selling a delton upper and lower parts kit with all other accessories for $450. All you need is a stripped lower reciever.
the same kit from del-ton.com is only 20 bucks more, yet you have the ability to customize a bunch of stuff, like chrome lined barrel and such, that might end up saving you money in the long run
some of their upgrades are kind of a rip off though
only other issue ordering from del-ton is that they build to order, so it takes 4-6 weeks