Welcome to the forum, djf123. Buying quality used gear is a good way to go, especially here in the US where there's much to choose from. However, it does require some care so that you get one with low risk of problems.
Model-specific parts (identical knobs, transformers, meters, enclosure pieces) for these are not available new. That's usually solved by buying a parts/not working one to transplant parts from (a.k.a., a parts mule) or getting lucky and catching someone who is parting theirs out, though prices can be rather high on individual pieces.
Generic parts such as resistors, capacitors, diodes, some transistors, and the like are usually available new, so old power supplies are still relatively repairable.
What was the condition of this power supply in the listing? Was it listed as "Used" or "For parts/not working"? As Andy asked, was it damaged in transit? Reply with more details so we can better help.