2020 iMac 27-inch 5K - Intel Core i9, 64GB, 1TB Flash, Radeon Pro 5700XT 16GB, Grade A | iPowerResale
Apple iMac Pro 27-inch 3.2GHz Intel 8-Core / 64GB RAM / 4TB SSD / Vega 56 8GB | eBay
Apple iMac Pro 2017 27 Inch 3.2 GHz 8-Core Xeon 1TB 64GB RAM Vega 64 1 – Quality Macs
Timetec 64GB KIT(2x32GB) Compatible for Apple DDR4 2666MHz for Mid 2020 iMac (20,1 / 20,2) / Mid 2019 iMac (19,1) 27-inch w/Retina 5K Display, Late 2018 Mac Mini (8,1) PC4-21333 / PC4-21300 MAC RAM at Amazon.com
Adamanta 64GB (4x16GB) Memory Upgrade for 2020 Apple iMac 27" w/Retina 5K Display & 2019 Apple iMac 27" w/Retina 5K Display DDR4 2666Mhz PC4-21300 SODIMM 2Rx8 CL19 1.2v DRAM RAM at Amazon.com
27 inch iMac with Retina 5k Display 2019 3.7GHz i5 2TB Fusion Drive 64GB RAM | Refurbished | Techable
64GB Memory Upgrade for 2019-2020 Apple iMac and 2018 Mac mini