Apple's online store currently has the refurbished Mac mini (model no. MC238LL/A) with a 2.26GHz Intel Core 2 Duo processor, 2GB of RAM, a 160GB hard drive, 8X SuperDrive, NVIDIA GeForce 9400M graphics processor, Bluetooth, AirPort Extreme WiFi, speaker, FireWire 800, USB and more for only $499.  That's $100 off the original price of $599, and the lowest price we have seen on this Mac model by $74.  FREE shipping is included and sales tax applies for residents of most states. 

Apple's online store also has the 2.53GHz Mac mini in refurbished condition with 4GB of RAM and a 320GB hard drive for $589, which is $210 off the list price.  The 2.66GHz Mac mini with 4GB of RAM and a 320GB hard drive is also available in refurbished condition at Apple's online store for $719.  Get a brand new, current-generation Mac mini with a 2.4Ghz processor, 2GB of RAM and a 320GB hard drive for $669.95 with FREE shipping at BHPhotoVideo.com.