Your best bet would be getting access to the Exchange forum here. M1 Rifles that occasionally appear in retail shops don't last long if they're in decent condition. You have to be in the right place, at the right time, with the money.
Marstar recently sold one in "good" condition(they say Overall Good. Not really a great description. Might have a nice stock with a poor barrel) at $750.
They do show up at gun shows, but there is a lot of over priced junk out there. A guy had one, at a local show, a few years back, in Poor condition that he thought was worth $775. More than a bit looney. Same guy wanted $4 each for clips. He lugged his stuff back and forth a lot.
Learn about 'em first.