You can find the CMP online at: http://www.thecmp.org/
Click on eligibility requirements, they're not too severe. I joined my state rifle association, and with the concealed handgun license on top of that I was good to go.
First purchase you have to notarize the application forms but after that you can just mail 'em in. I've been putting off buying a Garand for five years. Wish now that I hadn't waited so long.
Now's the time to buy. Especially now.