OWC 16GB PC21300 DDR4 2666MHz 260pin SO-DIMM Memory Ram Module Compatible with Mac Mini 2018, iMac 2019 and up, and Compatible PCs (OWC2666DDR4S16G) at Amazon.com
16GB DDR4 3200MHz (PC4-25600) DIMM - Desktop | Dell USA
PNY 16GB 2.666GHz PC4-21300 DDR4 SO-DIMM Unbuffered Non-ECC Laptop Memory Black MN16GSD42666 - Best Buy
CORSAIR Vengeance 16GB (2 x 8GB) 260-Pin DDR4 SO-DIMM DDR4 3200 (PC4 25600) Laptop Memory Model CMSX16GX4M2A3200C22 - Newegg.com
Crucial 16GB Single DDR4 2666 MT/s (PC4-21300) DR x8 DIMM 288-Pin Memory - CT16G4DFD8266 at Amazon.com
Samsung 16GB DDR4 PC4-25600 SO-DIMM
Apple Memory Module 16GB DDR4 2400MHz SO-DIMM (2x8GB) - Apple