Seriously if you don’t get a junkyard motor, and have a mechanic rip you off instead. I’m going to find a ladder so I can kick you in the nuts. 
Seriously though, tons of junkyards out there. Based on the description, it sounded like a spun bearing. I’m quite curious hom much damage was really done. If it’s the bottom end, there are some bottom-end parts on ebay that could be used to fix it inexpensively with some machine work.
If the top-end was really bad though junkyard motor all the way. Don’t even bother with getting it rebuilt if you are planning on selling it.
It’s time to learn the art of inexpensive repairs. 