This is my beloved little mini vise. I call him Hermann. Hermann
fits in my purse better than a chihuahua. It's $7.99 at Jewelry Supply. (How many people can say they have a vise in their purse? Or eggs?)
Here is a picture of Hermann in action, holding a pendant ready to be wrapped with wire.

Hermann really is MINI. The opening only goes to 1 and 1/4", and the table top you see (it's one of those cheapie laminate desks from Staples) is pretty thin and that's about the limit for that vise, it won't fit on a heavier table top. And as you can see, it isn't very deep either--the pendant that's pictured there is pushed all the way down and that's as far as it goes. For larger items you would need a bigger vise. But I've never found I needed anything bigger for jewelry. Best $8 I ever spent. It's amazing how much better my wrapping turns out when I have TWO hands free--I can use one hand to hold the loop at the top steady so it doesn't twist when I start wrapping, and I can use the other hand to wrap the wire. I can wrap a briolette or pendant really fast with Hermann. With no cussing.