RMSA3300ME78HBF-2666 16gb Pc4 2666MHz DDR4 So-Dimm Non-ECC 260 pin 1.2V Ram Memory for Laptop and All in One Desktop Computer (16gb Pc4 2666MHz DDR4 So-Dimm) at Amazon.com
New Genuine Memory for 16GB 16GB DDR4 2666 SoDIMM 01AG813 at Amazon.com
Crucial Memory Bundle with 32GB (2 x 16GB) DDR4 2666MHz SODIMM Upgrade kit CT2K16G4SFD8266 Compatible with iMac Retina 5K 27-inch 2019 (iMac19,1) and Mac Mini 2018 (Macmini8,1) at Amazon.com
Crucial 16GB Single DDR4 2666 MT/s (PC4-21300) DR X8 SODIMM 260-Pin Memory - CT16G4SFD8266 at Amazon.com
Crucial 32GB Kit (16GBx2) DDR4 2666 MT/s (PC4-21300) DR x8 SODIMM 260-Pin Memory - CT2K16G4SFD8266 at Amazon.com
AITC 16GB (2 x 8GB) Laptop Memory Module Upgrade DDR4 2666MHz SO-DIMM, Notebook Ram Module at Amazon.com
Transcend 16GB DDR4 2666 SO-DIMM 2Rx8 1.2V (TS2666HSB-16G) at Amazon.com
parts-quick 16GB Memory for Synology DS3617xs Compatible DDR4 ECC Unbuffered SODIMM RAM (Equivalent to Synology D4ECSO-2666-16G) at Amazon.com