OWC 16GB (2 x 8GB) PC21300 DDR4 2666MHz SO-DIMMs Memory Compatible with Mac Mini 2018, iMac 2019 and up, and Compatible PCs (OWC2666DDR4S16P) at Amazon.com
DRAM 8GB 2666MHz Memory Module DDR3 1600MHZ 204 Pin Memory Module POD12 Interface Module Used to Increase The Extra Memory of The Computer at Amazon.com
Brute Networks Y7N41-BN - 8GB DDR4-2666MHz 1Rx8 Non-ECC UDIMM (Compatible with OEM PN# Y7N41) at Amazon.com