Used Apple iMac 21.5-inch (Aluminum) 2.8GHZ Quad Core i5 (Late 2015) MK442LL/A - GainSaver
Late-2015 Apple iMac with 2.8GHz Intel Core i5 Quad-core (21.5-Inch, 8GB RAM,
Apple iMac Retina 5K, 27-inch, 3 TB, 3.3 GHz Intel i5, 24Gb RAM, Late 2015 | eBay
Amazon.com: Late 2015 Apple iMac with 3.2GHz Intel Core i5 (27 inch Retina 5K, 8GB RAM, 512GB SSD) Silver (Renewed) : Electronics
Apple iMac 27" Retina 5K - Late 2015 Reviews, Pros and Cons | TechSpot
iMac (Retina 5K, 27-inch, Late 2015) - Technical Specifications
Apple iMac review (21.5-inch, 2015): 4K is optional, faster hard drives shouldn't be | Engadget
5K iMac 27-inch 2015 Review | Trusted Reviews
Apple iMac Retina 5K 27-inch 4.0GHz Quad-core i7 (Late 2015) | 256GB - 3TB | eBay
Apple iMac 21-inch review (late-2015): A little computer with a LOT of pixels
Differences Between Late 2015 iMac Retina 4K/5K Models: EveryMac.com
Apple iMac review (21.5-inch, 2015): 4K is optional, faster hard drives shouldn't be | Engadget
iMac Intel 21.5" EMC 2889 Teardown - iFixit
Apple 27" iMac with Retina 5K Display (Late 2015) Z0SD-MK4721-BH
Apple iMac 27" (1TB SSD, Intel Core i5 6th Gen., 3.20 GHz, 8GB) Desktop - Silver - FK472LL/A (2015) for sale online | eBay
Apple iMac 27-Inch With Retina 5K Display (2015) Review | PCMag
Apple iMac (21.5-inch, Late 2015) review | TechRadar
Apple iMac "Core i5" 3.2GHz 27-Inch (5K, Late 2015) MK462LL/A A1419 8G – Coretek Computers
