27" iMac with Retina 5K display (Late 2015) priced with 3 Years of AppleCare. Coupons, Deals, and Lowest Prices on all things Apple | AppleInsider Price Guides
Amazon.com: 2019 Apple iMac with Retina 4K/3.6GHz Intel Core i3 (21.5 inches, 256GB SSD)(Renewed) : Electronics
Amazon.com: Late-2015 Apple iMac with Retina 5K/3.2 GHz Intel Core i5 (27- Inch, 8GB RAM, 1TB) (Renewed) : Electronics
OWC 16GB (2 x 8GB) PC14900 DDR3 1866MHz SO-DIMMs Memory Compatible with 2015 (Late) iMac 27" w/Retina 5K Models and Compatible PCs (OWC1867DDR3S16P) at Amazon.com
Amazon.com: Apple iMac Pro 27in All-in-One Desktop,Intel,32 GB, Space Gray (MQ2Y2LL/A) (Renewed)1000 GB,macOS High Sierra : Electronics
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Amazon.com: Late 2015 Apple iMac with 3.2GHz Intel Core i5 (27 inch Retina 5K, 8GB RAM, 512GB SSD) Silver (Renewed) : Electronics