Not really adding anything to the thread, but.... Ordinarily I would tell you no, the M1 Carbine isn't worth getting. But, for that price, it sounds like a heck of a deal. M1 Carbines have priced themselves into the collector status over the last few years meaning that IMO the only person that could justify the price is a collector. As a carbine, they arn't worth it.
Assuming the carbine is a USGI carbine, you are paying about half price for it. I would certainly go for it.
I paid more than that for mine. I think I paid about that much for my last one 15 years ago.