on the open market than 12 months ago in the 700-900 range as the mix-masters are dis-assembled and collectors have created pseudo-correct rifles. Collectors re-assemble mixed parts shooter grades to get some of their funds back. Check out the CMP forums for a good idea of what is available, and be patient. More will become available in the open market and you wont have to settle for a replica like the one listed.
I enjoy shooting the carbine even at 25 cents a round. All of my mags from 15-30 rounds are GI issue, i recommend you stick with GI if possible.