ExperCom offers the Apple iMac Intel Core i7 3.4GHz 27" Desktop upgraded with 16GB RAM for $2,548 plus around $29 for shipping. That's the lowest total price we could find by $298. Features include an Intel Core i7 i7-2600 3.4GHz Sandy Bridge quad-core processor, 27" 2560x1440 LED-backlit widescreen glass LCD, 16GB RAM, 2TB 7200 rpm hard drive, SuperDrive, Radeon HD 6970M 2GB graphics, AirPort Extreme (802.11n), two Thunderbolt ports, FaceTime HD camera, Bluetooth 2.1+EDR, Gigabit Ethernet, and more.

Note that ExperCom does not specify which OS this iMac contains.