I bought the Wintersteiger Freeride Ski & Snowboard Tuning Vise from Amazon last winter and it has worked reasonably well.
The rubber feet on top of the vise minimizes slip when I am scraping the wax off the base and the edge groove holds the board securely for working on the edges.
The vise gap can clamp onto a table top of 2.25 inches or smaller and hasn't budged since I installed it a year ago.
Swix and other brands make similar vises. Check out what your local shop has to offer and you may find better deals on a similar product.