8GB DDR4 - DDR4 RAM for Dekstops - 2666MHz DIMM - VisionTek | Dell USA
OWC 8GB PC21300 DDR4 2666MHz SO-DIMM Memory Compatible with Mac Mini 2018, iMac 2019 and up, and Compatible PCs (OWC2666DDR4S08G) at Amazon.com
Apple Memory Module 32GB DDR4 2666MHz SO-DIMMS (2x16GB) - Apple
OWC 32GB (2 x 16GB) PC21300 DDR4 2666MHz SO-DIMMs Memory, Compatible with Mac Mini 2018, iMac 2019 and up, and Compatible PCs, (OWC2666DDR4S32P) at Amazon.com