Crucial 64GB (2PK 32GB) 3200MHz speed PC4-25600 DDR4 SODIMM Laptop Memory Kit Green CT2K32G4SFD832A - Best Buy
2 x 64GB PC4-21300 2666MHz | DDR4 RAM | Aventis Systems
Timetec Hynix IC 64GB KIT(4x16GB) Compatible for Apple 2019 iMac 27-inch w/Retina 5K Display DDR4 2666MHz PC4-21300 2Rx8 CL19 1.2V SODIMM Memory RAM Upgrade (64GB KIT(4x16GB)) - Newegg.com
64GB Server RAM Module Kit | DDR4 2666MHz | Integral Memory
64GB PC4-21300 DDR4-2666MHz Registered Load Reduced Memory // STI Kansas City
OWC 64GB (4 x 16GB) PC21300 DDR4 2666MHz SO-DIMMs Memory Compatible with Mac Mini 2018, iMac 2019 and up, and Compatible PCs (OWC2666DDR4S64S) at Amazon.com
Crucial 64GB (2 x 32GB) DDR4 2666 (PC4 21300) Unbuffered Memory for Apple Model CT2K32G4S266M - Walmart.com
Apple Memory Module 64GB DDR4 2666MHz SO-DIMMS (2x32GB) - Apple
OLOy DDR4 RAM 64GB (2x32GB) 2666 MHz CL19 1.2V 260-Pin Laptop Gaming SODIMM Upgrade for 2019/2020 iMac 27-inch with Retina 5K Display Late 2018 Mac Mini (MD4S322619MZDC) at Amazon.com