I just found this website that gives a pretty good picture of what M1 Garand rifles sell for in the US when bought through their Civilian Marksmanship Program (CMP). Personally, I wouldn't consider anything less than "correct grade" since the lower grades are just beaters IMHO. These are the lowest prices you'll likely find there: http://www.thecmp.org/m1garand.htm
Of course you have to live in US and be a citizen or at least legal resident to even be able to buy from the CMP folks 
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