Swivel jaw vises are still listed in Milwaukee Morgan’s catalog, but I can’t find any retailers that list the vises or prices.

The only two contemporary vises in production with a swivel jaw are made by WoodRiver (overseas) and they are woodworking vises, not machinist’s vises. One is a knock off of an Emmert Patternmaker’s vise with more of a tilt mechanism to swivel the jaw, and the other is favored by Gunmakers and Luthiers and has two swivel jaws that rotate 360 degrees with wooden jaw faces. Hope that helps