I have one of these, though I think my is addison branded or something. A guy had a bunch on ebay maybe about a year ago for $15 plus $20 international shipping. Best part about it is the split spacebar, so you could easily cut one of the traces to the left spacebar switch and run the jumpers to backspace to make sort of an erase-ease setup, or make it into a function key like the spaceFN layout!
Hadn't seen an Omnikey Evolution without the trackpad, that's kind of different as well
