The Apple Store offers a selection of factory-refurbished Apple iMac desktops, with prices starting from $929. Plus, they all qualify for free shipping. These desktops come with a 1-year Apple warranty, the same as new iMacs. A couple of best bets, with prices compared to new models:

• Refurb Apple iMac ME086LL/A 21.5" Haswell i5 Quad 2.7GHz for $1,099 (pictured, low by $91)
• refurb Apple iMac MF886LL/A 27" Haswell Core i5 Quad 3.5GHz for $1,949 ($300 off)