This deal has ended.
The Apple Store now has Apple Certified Refubished Mac Minis starting at $469.99 plus free shipping. Mac refurbs include the same 1-year warranty as new Macs (extendable to 3 years if you purchase AppleCare). One of the best deals on this list is a 2012 model with a 2.5GHz i5 processor. It's 15% off list for a low price of $509. It has 4GB of memory and a 500GB hard drive. Sales tax is charged in most states.