Apple's online store currently has a selection of refurbished iMac models at discounted prices.  Save $300 on the refurbished 27-inch iMac (model no. MB953LL/A) which offers a 2.66GHz Intel Quad-Core i5 processor, 4GB of RAM and a 1TB hard drive as well as a 8x SuperDrive, ATI Radeon HD 4850 graphics card, built-in iSight camera, and it comes with a wireless Magic Mouse and keyboard.  This iMac was $1999, but has been cut to $1699.  FREE shipping is included and sales tax applies for residents of most states. 

A variety of other refurbished iMac configurations are also available at Apple's online store, like the 21.5-inch iMac with 3.06GHz processor, 4GB of RAM and a 1TB hard drive, now $1299.  The 27-inch iMac models start at $1449 for the 3.06GHz configuration with 4GB of RAM and a 1TB hard drive.  iMac configurations top off at $1849 for the 27-inch iMac with a 2.8GHz Quad-Core i5 processor, 4GB of RAM and a 1TB hard drive.