They run anywhere from $5k to $10K depending on size. But they depreciate fast. You can almost always find a used Bienfang press for about $1500 somewhere. Most also require an external vacuum pump. They run off 220V single phase, and consume anywhere from 2 to 6 kilowatts. You may need to do electrical work to get one installed at your desired location.
The Drytac HGP's are manufactured in the UK, so if you're in those parts you can probably get a better deal! Those have a metalized glass surface, which lets you see the artwork package as it's being compressed. I guess that's a good idea. I think those may have a built in vacuum pump, not sure about that.
In the US you mostly find Bienfangs AKA Vacuseal or something like that, which have a different design that includes an opaque cover that is ever so tempting to use as a table. Definitely requires an external pump, which is actually not that big a deal.
You might want to research those things a bit before jumping. They heat up the room during the cycle, and there is a fairly lengthy duty cycle which could theoretically become a bottleneck in a heavy production environment, but not for most users. They have many advantages over a normal drymount press, particularly if you are mounting RC media. One of the main disadvantages is that the physical size of the diaphragm is your absolute size limit, whereas you can mount really big pieces in sections with an old fashioned drymount press, but not without some pain. Could go on. Did I say they take up a humongous amount of floor space?
Check out the used equipment section at thegrumble.com, and of course good old ebay, and of course your friendly local failing framing shop, how sad that is.