If you haven't checked out Palmetto State Armory website and you want inexpensive (not cheap) AR Lowers you should go there now. Here is an example

http://palmettostatearmory.com/smith-wes...ire-lowers.html

and another

http://palmettostatearmory.com/psa-ar-15-complete-blem-lower-classic-edition-no-magazine.html