This site links to information about the Civilian Marksmanship Program as well as to what they have for sale to the public. Still the best place to buy a M1 Garand without looking at it first, although you can travel to one of their gun sales sites and personally pick one out. Looks like they are all out of Carbines and 03's and much else, but their offerings come and go over time.
http://www.odcmp.com/
Civilian Marksmanship Program
Moderator: Niner