I've used a vacuum chuck for quite a few years now & wouldn't be without mine, so easy to use. As to cost you can google & compare types & cost. I ve had mine too long to give an up to date costing. I made my own at first & it worked well. Google this as will & look at YouTube for how to make if this is the route you want to go. The two types of vacuum generators are Venturi which works off a compressor to give vacuum. The other type is a vacuum pump, of which there are several versions, oil filled or oilers.
Hope this is of help.