The Apple Store offers its factory-refurbished Apple iMac Intel Core i5 3.5GHz 27" Retina 5K Desktop, model no. G0QX2LL/A, for $2,549 with free shipping. That's $450 under the best price of a new unit. Features include an Intel Core i5 3.5GHz quad-core processor, 27" 5120x2880 LED-backlit Retina display, 16GB RAM, 512GB SSD, AMD Radeon R9 M290X 2GB graphics card, 802.11ac wireless, and OS X Yosemite. A 1-year Apple warranty applies.