Ok. Here's the deal.
Just got off the phone with "Robert" from DataDesk. He's been with the company since "the beginning", so he has some good knowledge of where they are as a company now and where they are going.
The ADB keyboard linked above (the Mac-101e) hasn't been built since 1995. They had a few dozen in stock over the past decade and would sell a handful of them per year. Just recently, they sold a dozen (which he attributes to an online review that happened not too long ago). He believes they have a few left...if they do, he can sell them for $89.95 + shipping.
They have been contemplating for a while whether to start making them again (either in the original form, or updated to USB). He said it would be relatively easy to start making them again as USB...it would take changing the electronics...but the real expense is in the enclosure. Which leads to another sticking point...
They feel that if they were to be marketable, they'd have to change to a more modern-looking enclosure and, obviously, add some keys as well. This would be even more pricey. They understand that it is hard to differentiate themselves in the "standard keyboard" market by qualilty alone (certainly WE understand, but the masses don't).
So, basically, they are on the fence.
I am wondering what it is we can do as a quality-keyboard-loving community to encourage companies like this to make modern-day, quality keyboards. I definitely encourage you all to contact them and let them know you'd be interested in new offerings if/when they become available. Perhaps that would help nudge them a bit.
I know that I'd buy a few....if only to thank them for taking the risk.