Drytac and Seal are the better known pro level laminators. Buy them used, so you don't pay so much for the units. Ask Dan Berg on the forum as he has a couple units.
I have a cheap 42" chinese made cold press laminator from eBay. It was a lot of headache as the initial quality was low (did not work out of the box), but it does what I need to do now.
How big of prints are you planning to make? 30"-44" on the long side or the short side?
As a starting point go to YouTube and watch Drytac's video series on laminating,quite comprehensive.
A cold roll laminator would be good for gatorboard,dibond and acrylic face mounting.
We also use ours for limited over laminating but find it to be a little plasticky for photographs.
The price range can be from under a thousand to over ten. The cheaper ones are all cold roll and manual. (Crank)
When purchasing new or used the first thing to check is the nip opening which is the thickness of material your machine will accept. I tell folks to look for at minimum a 1/2".
You can then run 1/2" thick gator or multiply through the machine.
My smaller machine can accept 3/8" material which is good for 90% of what I do.
The other option that Dave has mentioned is the vacuum press,again go to YouTube and search for videos.
Drytac and D&k are the bigger players in the field.
For roll laminating and mounting you will find out the learning curve will run the gamut for some from easy to making you take up drinking. This is where the vacuum press shines much easier learning curve.
Dust free environment is a must when facemounting.
Good luck and do not get discouraged