You can do a loading, perhaps not a "full" loading on the test fixture. I just grab the flywheel and retard it's rotation to increase the load when testing. This is a bit harder on the PS/3 test fixture as they used a very small motor in the fixture, most likely an HO motor.
I believe the MSRP of the two PS/2 3V boards was $80 for the power supply and $120 for the processor. Of course, as Stan says, now the price is whatever you can find. I have an extra power supply board if you're looking for one of those.