Where to find a good M54?

[paramax55]

Well, after my water pump belt fiasco and the unicorn radiator that doesn't exist, I finally got the head gasket tester on it today and it turned green. I even did it a second time because - of course I did. You always hope beyond hope.

I've heard many a horror story about buying an engine online and finding out it's bad after you get it in. So that points to one of the big name sellers. But then you're paying out the nose. For that price, I could get a 330i or a 530i donor off marketplace and pull that engine and I'd be able to check it out in a running car. But it's probably going to be high mileage and it would be smart to refresh it while it's on a stand. But if I'm going to refresh one, why not do mine and save a bunch of time and money from buying a donor car - mine runs great and has no signs of a problem (yet) other than the green test fluid... decisions, decisions...