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I have done that with a diamond blade on a regular skill saw. You can fill up a big plastic soda bottle with water, and puncture a hole to line up with the height of the middle of the blade -- so that you can squeeze the bottle and shoot a thin stream of water to keep the blade from getting too hot. Home Depot carries a cheap blade.
Anybody know where to pick up a good, cheap laser? :-)
One of our members claimed to unbolt the head from his HF 10" wet saw and use it freehand to make such cuts. (This is not a recommendation...) Do not neglect your local stoneyard, for a few bucks they'll cut it to the size you want, and polish the edges too. If it saves you from getting injured, it's cheap at any price.
I have drilled small holes near the bottom of a tin can, filled it with water, and placed it on the surface to be cut. It provides a continuous stream of water to the surface to keep the skill saw blade cool provided both the saw and the tin can can both fit on the same surface.
The Home Depot in my area rents several diamond blade concrete saws, from a hand held, gas powered, 14 inch to a bigger walk behind unit. I'd opt for the stone place to do the major long cuts, if they break it, you're not left holding the pieces.