I haunted ebay for a while and eventually wound up with a few of the small older HP 6216A units in very nice shape. It took a bit a patience, but they are built like a tank and I paid no more than $60 inc shipping for any of them. I also found some BK 1651 triple output units at good prices, under $50 with shipping. They are solid units that were also sold by Tektronix as the CPS250 so a detailed service manual and schematic were available. I just got a nice BK bench DMM for $20 shipped (non-auto ranging). The bankruptcy of the ITT schools a couple years back flooded the market with a lot of decent equipment at good prices. No way could I build anything that approaches the quality of any of these units. Just my 2 cents.