CMP sold out a couple years ago. A company called Inland or Auto ordanance makes a repro model. No experance with it. It runs around $850.
They've been repro'd since the 50's, when they started running out of wartime receivers to assemble into whole guns. Iver Johnson, Universal, Plainfield Machine Co, Rock Island, Springfield, just to name a few big ones. 6.1 million carbines made during the war, probably close to 2 million (according to the"War Baby" book series) made after the war by various people and companies. To top it off, other than the later production Universal carbines, and the odd caliber ones, all use GI spec or close to it for parts, much like ARs do now.
Carbines aren't super plentiful on the market right now, but they're still out there. Just scored a 60's Iver Johnson out of KC for $250. Barrel and receiver are new production, everything else is GI parts. Additionally I think they're squirreled away by grandpas the nation over to a higher degree than people give them credit for. They're handy little ranch rifles with zilch for recoil, being essentially the first purpose built pistol caliber PDW.