the cmp *was* selling new criterion 4140 barrels for 165.00 in the box.
if it's got a TE of 3, i would not give over 100 bucks for it. why? why would anyone except a competitive shooter swap out a relatively new barrel? maybe it's bent? did you check the muzzle wear or check for gouges and nicks?
also, the cmp is selling newly manufactured stock sets for garands that are beautiful, made of american black walnut, and fit absolutely *perfectly* on a garand. 120.00 plus shipping. brand damned new. i got one and it looks super on the winchester.
if the stock is in good shape, i'd say 75 bucks. if it's a rare stock with even rarer markings from an inspector general who only lasted a month, or something like that, it could be worth more to you than a "used stock". i am not qualified to make that call, and won't BS you by leading you to believe i can.
garands are neat rifles. some of them are quite collectible. check out the auction page of the cmp. they've got an 03A3 sniper rifle w/scope up now for like, $3.5k+... way too pricey for my blood. that's serious gun collecting, and an arena where you could easily get burned by outbidding others without knowing the profit potential.