PNY Performance 8GB DDR4 DRAM 3200MHz CL22 SODIMM Notebook/Laptop Memory Black MN8GSD43200-TB - Best Buy
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
Apple Memory Module 16GB DDR4 2666MHz SO-DIMMS (2x8GB) - Apple
New Genuine HP 16GB PC4-21300 DDR4 2666MHz SoDimm Memory Module 933286-001 - Walmart.com