DukeIt was in the Tools depertment. It's called a Ridgid Flip-top. One of the Home Depots in my area carries them; the other doesn't. Call and ask for it by name, and if they don't carry it, try another store.
There's a similar product that seems to be made by more of a specialty shop; I can try to find that for you. Also, Northern Tool & Hydraulic has a similar thing ($19) with a roller that could be removed if you could make a mounting plate for the wheel.
Duke, is this stand pretty solid? It doesn't look like it from the pictures, but I would assume since it is a workbench that it would be pretty well stable. I'm going to see if my local HD has this today.