Scott, check out the little machine shop web site. They have a chart that compares the mini mills. They are all made in the same factory in china, and the site claims that they have seen no real difference in quality from one to another. I just got mine about two weeks ago from cummins tools. It was 100.00 cheaper than the others, and frankly the only one who had them in stock at the time I was buying. The down side is that they charge 100.00 to ship as opposed to Grizzly's 58.00 anywhere in CONUS rate. Chedk out the chart. I believe the Griz comes with some extra collets, and may be worth the extra few bucks (if its not on back order...)
It may also be worth the drive to a Harbor Frieght is there is one near you. you may be able to save on the shipping. Just call in advance to make sure they have it in stock. I tried Scranton, Syracuse, Albany, and another store and none had it in stock. Glad I called before driving two hours!
If you do get it from cummins, try and have it shipped to a business. It has to be truck shippped (to heavy for UPS) and they charge 200>00 to ship to a residence and only 100.00 to ship to a business.
Good luck!
PS: Don't forget you need a milling machine vise to do ANYTHING and that doesn't come with the machine. After waiting forever to finally get my mill,...I had to wait another week to get my vise. Rather frustrating.