You might also check the carbine parts for sale thread on the CMPicon forums,
M1 Carbine - CMP Forums

Members there often are thinning the herd, and put carbines up for sale at slightly more than they paid when buying from the CMP. If you lived near SC, I could clue you into a shop down near Greenville that had several at fair prices a few months back. Come to think of it, I need to give that guy a call, and see what he's got now.

Or here:
R. M1 Carbine USGI unrestored

I can't say for sure this one isn't import marked though, but a decent price if it's in the condition they say it is.
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