I bought a cheap Chinese one that looks similar off ebay for $40, but I would not do that again. I usually don't mind cleaning up something like this, and I did end up with a workable cross slide vise in the end, but the machining on it was very crappy, crappy paint, the casting was half-a$$ed finished, it had the wrong size set screws on the collars which popped out as soon as I tightened them, and I had to grind off about an 1/8" on one of the locking collars because the locating hole was in the wrong place. Even small stuff like nuts were drilled and tapped off center. I probably spent about 12 hours cleaning it up, knocking off sharp edges, tightening up the fit and maybe $6 on correct size screws and nuts. NOT GOOD!
Unless you intend to, or can, personally insect the vise before you buy it, I would probably go with a known brand (Shop Fox, Wilton, Yost, Klutch) and just pay a little more. JHMO.
I don't think you need much of a cross slide vise, as I watched one guy on Utube set the jig up in a nice cross slide vise, on a nice floor drill press, and then instead of using the slide screws, he just moved the whole vise back and forth under the drill press. LOL, I don't think he knew how to use it, or at least had no training, but obviously he had the money for the nice tools.