Hello Anvil,
I think this is the site you are looking for http://atlas-scientific.com/. I like these units, the phidgets pH unit works good too and can select ranges for an ORP probe as well! If you want an OSHW design you can find one at my site, we even have a small tuturial about this which I am in the process of updating for another project its tied too. These pH units have been popular lately, we sold out a bit ago and I expect atlas and pHidgets have been selling lots. I dont think there are many others on the market but they arent too difficult to make, I would bet a fair portion of people around here have everything they need on hand to make a simple probe interface 