we use Agilent 34970A data collection systems with 20 channel Agilent 34901A multiplexer cards at work, I will have to check the available cards as the ones we use are for thermocouples, they only have two fused voltage channels. I assume it could use different cards for only voltage. It uses 20 channel plug in cards with 3 card slots. I imagine you could get one of these on feebay but I wouldnt know how to go about trusting it was still working. The software we have is for XP but I also assume that could be updated, maybe not. Anyway, they seem reliable as we have done countless DOEs on the two we have with no issues over the 7 years Ive been there.

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1982 300CD Turbo (Otis, "ups & downs") parts for sale
2003 TJ with Hemi (to go anywhere, quickly) sold
2001 Excursion Powerstroke (to go dependably)
1970 Mustang 428SCJ (to go fast)
1962 Corvette LS1 (to go in style)
2001 Schwinn Grape Krate 10spd (if all else fails)