We are selling our stock of used omnivises from our training center. I will always keep one for myself because they are great for holding an unusual board in place, but newer board holders have gotten our recent recommendation for standard equipment. This is an old standby. You can use it upside down, rightside up, on it's side to hold anything that needs a vise grip between its plates. This is heavy versatile little tool, and can even be used to put pressure on a CPU for data recovery when the only problem is a cold contact.
These are in used but working condition--probably discolored or have some dried flux on it. When they are gone, they're gone!