CNCRouterParts.com
My personal review of this company

I ordered bearing blocks and some Nema 23 motor mounts and they are machined very well. The motor mounts set up perfectly without any fussing with them. The bearing blocks had a nice tight fit and I had to press the bearings in using the face plate for the blocks. I tightened one side at a time 1/4 turn at a time. This seems to worked as the bearings are now in place.

As soon as I get time, I will take some pictures to post on here.