Apple Store offers the factory-refurbished Apple Mac mini Intel Ivy Bridge Core i5 2.5GHz Desktop, model no. MD387LL/A, for $509 with free shipping. That's tied with our refurb mention from three weeks ago and $41 under the lowest total price we could find for a new unit. It includes an Intel Core i5-3210M 2.5GHz Ivy Bridge dual-core processor, 4GB RAM, 500GB hard drive, 802.11n wireless, Bluetooth, Thunderbolt, memory card reader, and Mac OS X 10.8 (Mountain Lion). A 1-year Apple warranty applies.