Several companies sell gear cutters; MSC (http://www.mscdirect.com) is probably the most well-known although others may have a better selection, I'm not sure.
A rotary table would be perfectly adequate for use in cutting gears, although it may be somewhat inconveient to set up the work. You need to "somehow" hold the gear blank so you can get at it with the gear cutter, and on a rotary table that may take some imagination. You would also need a rotary table that can be set vertically (a horizontal/vertical model). A dividing head would probably be a lot easier to use, but a rotary table would certainly be accurate enough for anything you're likely to be doing.
I've never seen a Grizzly mill; I have seen Jet, and think they are pretty good. I have seen Enco, and I am unimpressed.
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