27 inch iMac with Retina 5k Display 2019 3.7GHz i5 4TB SSD 64GB RAM | Refurbished | Techable
2020 2019 5k 27 Inch Imac 64gb 32gb 16gb 8gb Ddr4 2666 2667 Apple All-in-one Pc Memory Ram - Rams - AliExpress
OWC 64GB (2 x 32GB) PC21300 DDR4 2666MHz SO-DIMMs Memory Compatible with Mac Mini 2018, iMac 2019 and up, and Compatible PCs (OWC2666DDR4S64P) at Amazon.com