16GB (1x16GB) DDR4-2666MHz PC4-21300 1.2V SODIMM Laptop Memory by NEMIX RAM at Amazon.com
Crucial RAM 16GB Kit (2x8GB) DDR4 3200MHz CL22 (or 2933MHz or 2666MHz) Laptop Memory CT2K8G4SFRA32A at Amazon.com
Kingston 16GB DDR4 2666MHZ SODIMM at Amazon.com
Kimtigo DDR4 16GB Laptop Dram 2666MHz (PC4-21300) CL19 (Compatible with 2400MHz or 2133MHz) 1.2V Notebook (SODIMM) RAM Non-ECC Unbuffered Single Rank 260 Pin PC Computer Memory Module Upgrade 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
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