Here are a couple of vises developed by a guy on another woodworking forum. They are both designed to be built in the shop for not a whole lot of money. I did up plans for them.
The first is a Moxon-inspired vise. This is a view from the back side. It clamps to the bench with tabs on the ends of the near piece.
And he calls this one a portable vise. It also clamps to the bench or, as he says, a picnic table, dining table, etc.
In both cases they use dumbbell handles that are threaded over their entire length and the spinlock collars that come with them. Pieces cut from an inexpensive HDPE cutting board act as the slippery bits for the collars to bind up against. Over on this side of the pond the dumbbell handles with two collars are available for less than $8. The Moxon-style vise only requires one of those screws.