v-Color 32GB (2 x 16GB) ECC SO-DIMM DDR4 2666MHz (PC4-21300) for NAS Micro Server/Workstation/Compatible with Synology 21 Series 2Rx8 CL19 1.2V (TES416G26D819K-VKC) at Amazon.com
Adata Ram Memory So Dimm 260pin Ddr4 4gb 8gb 16gb 32gb 2666mhz 3200mhz For Laptop Notebook Memory High Performance Laptop Memory - Rams - AliExpress
Crucial 32GB (2 x 16GB) 260-Pin DDR4 SO-DIMM DDR4 3200 (PC4 25600) Laptop Memory Model CT2K16G4SFD832A Laptop Memory - Newegg.com
OWC 32GB PC21300 DDR4 2666MHz SO-DIMM Memory Compatible with Mac Mini 2018, iMac 2019 and up, Dell, HP, Lenovo, ASUS and Compatible PCs (OWC2666DDR4S32G) at Amazon.com
Apple Memory Module 32GB DDR4 2666MHz SO-DIMMS (2x16GB) - Apple
Apple Memory Module 32GB DDR4 2666MHz SO-DIMMS (2x16GB) - Apple