They had a few racks of these at the CMP North store a month or so ago when I visited. They're rebuilds with new stocks, a new .308 barrel and new finish.
Probably about as close as you'd get to a "new" M1. I wouldn't worry about the supply of .30-06 though. Even if you don't reload, the CMP sells new manufacture Lake City, about $110 shipped for 200 rounds.