ebay has Apple 21.5" iMac with Retina 4K Display (Late 2015) MK452LL/A(Manufacturer refurbished) for $999.99
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21.5" Retina 4K IPS Display
4096 x 2304 Screen Resolution
3.1 GHz Intel Core i5 Quad-Core
8GB of 1867 MHz LPPDR3 Onboard RAM
1TB 5400 rpm HDD
Integrated Intel Iris Pro Graphics 6200
802.11ac Wi-Fi, Bluetooth 4.0
Thunderbolt 2 + USB 3.0
Magic Keyboard & Magic Mouse 2 Included
macOS Sierra
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