A-Tech 16GB (2x8GB) RAM For 2019 IMac 27 Inch Retina 5K, 2018 Mini DDR4 2666MHz | eBay
Factory Original 64GB (2x32GB) Memory Upgrade for 2020 & 2019 Apple iMac 27" w/Retina 5K Display & 2018 Apple Mac Mini DDR4 2666Mhz PC4-21300 SODIMM 2Rx8 CL19 1.2v RAM Adamanta at Amazon.com
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Factory Original 64GB (2x32GB) Memory Upgrade for 2020 & 2019 Apple iMac 27" w/Retina 5K Display & 2018 Apple Mac Mini DDR4 2666Mhz PC4-21300 SODIMM 2Rx8 CL19 1.2v RAM Adamanta at Amazon.com
Install memory in an iMac - Apple Support
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Amazon.com: OWC 32GB (2 x 16GB) PC19200 DDR4 2400MHz SO-DIMMs Memory Compatible with Mac Mini (Late 2018), 27" and 21.5" iMac (Mid 2017), and Compatible PCs (OWC2400DDR4S32P) : Everything Else
Apple 27" iMac® with Retina 5K display (Latest Model) Intel Core i7 (3.8GHz) 8GB Memory 512GB SSD Silver MXWV2LL/A - Best Buy
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Rent a Apple 27" iMac Pro 10 Core AMD Radeon Pro Vega 64(16GB HBM), Best Prices | ShareGrid Los Angeles, CA
Apple iMac with Retina 5K display - All-in-one - Core i5 3.5 GHz - RAM 8 GB - Hybrid Drive 1 TB - Radeon Pro 575 - GigE - WLAN: 802.11a/b/g/n/ac, Bluetooth
64GB (2x32GB) NEMIX RAM Memory for 2019 Apple iMac 27 inch Retina 5K (iMac19,1 A2115), 2018 Apple Mac Mini (Macmini8,1 A1993) - Newegg.com