You know, for less than $100, you could probably put together a very
adequte supply from OTS PSUs available from Jameco. A 5v 50A open frame
switcher runs less than $50--and they do have 15v switchers also.
One of the concerns about using any third-party PSU though, would be power
up/down sequencing. Are there specs available for that?
Cheers,
Chuck