Many good Sorenson, HP, Agilent, and other units always seem to be available on ebay. Be careful how you pay.
Search for "Surplus Test Equipment" on google. good luck, Brian I am looking for an inexpensive AC to DC power supply with an ADJUSTABLE 0-80 V dc and up to 125 A output. I am sure many of these power supplies exist now that the telecom industry is not doing too well.
