I have a FB friend from Texas who has several receivers (as far as I know, he's not on this forum).  He purchases them on EBay and GB.  He uses them along with parts he has acquired to resurrect rifles, usually repairing cutdown stocks in the process.  He's very careful to make them faithful, and does NOT fake cartouches or misrepresent what they are.  My guess would be that he is purchasing the receivers from the guys in FL and Pacific NW that are stripping them.