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
Crucial 16GB Single DDR4 2666 MT/s (PC4-21300) DR X8 SODIMM 260-Pin Memory - CT16G4SFD8266 at Amazon.com
Amazon.com: Kingston FURY Impact 32GB (2x16GB) 3200MT/s DDR4 CL20 Laptop Memory Kit of 2 | Intel XMP | AMD Ryzen | Plug n Play | Low Power Consumption | KF432S20IBK2/32 : Everything Else
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
Kingston 16GB DDR4 2666MHZ SODIMM at Amazon.com
HP S1 Single RAM 16GB DDR4 2666MHz CL19 Laptop Memory - 7EH99AA#ABC at Amazon.com
TEAMGROUP Elite DDR4 16GB Kit (2 x 8GB) 2666MHz PC4-21300 CL19 Unbuffered Non-ECC 1.2V SODIMM 260-Pin Laptop Notebook PC Computer Memory Module Ram Upgrade - TED416G2666C19DC-S01 at Amazon.com