Amazon.com: Late-2015 Apple iMac 21.5 with 4K Retina Display/3.1GHz Intel Core i5-5675R Quad-Core (21.5-inch, 8GB RAM, 1TB) (Renewed) : Electronics
A-Tech 8GB RAM for Apple iMac 2017 (27 inch Retina 5K & 21.5 inch Retina 4K) | DDR4 2400MHz SODIMM PC4-19200 1.2V 260-Pin SO-DIMM Memory Upgrade Module at Amazon.com
Amazon.com: Mid 2020 Apple iMac with 3.1 GHz Core i5 (27 inch Retina 5K, 8GB RAM, 256GB SSD) (Renewed) : Electronics
Apple iMac with 4K Retina display (21.5-inch, 2015) review: Apple packs more pixels into its smallest iMac - CNET
Amazon.com: Kuzy Dust Cover for iMac 24 inch 2021 M1 A2438 A2439 - Computer Monitor Cover for Apple iMac 21 inch 2020 - 2017 Retina 4K - Dust Protection for Mac 21.5 Protective Screen and Accessories, Gray : Electronics