IMO My experience with bone yard parts far outwieghs rebuilds.
You have to be able to spot OEM components and go with it for a fraction of the cost.

Thays funny that you say that sir. There were two opportunitys that I had to get AC compressors from yard- would have cost $40, but I was missing a socket....twice....
I did get an alternator that lasted me a year and a half and only paid $30 for. SOmetimes one can really luck out at the yard...