MICRON 16GB DDR4 PC4-19200 2400MHZ ECC REGISTERED RAM MTA18ASF2G72PDZ-2G3B1 USA at Amazon.com
parts-quick 16GB Memory for Lenovo Flex 4 (14-inch) DDR4 2400MHz SoDIMM RAM at Amazon.com
Amazon.com: OWC 32GB (2 x 16GB) PC19200 DDR4 2400MHz SO-DIMMs Memory Compatible with Mac Mini (Late 2018), 27" and 21.5" iMac (Mid 2017), and Compatible PCs (OWC2400DDR4S32P) : Everything Else
G.Skill Ripjaws X Series 16 GB (2 x 8 GB) 240-Pin SDRAM (PC3-12800) DDR3 1600 CL10-10-10-30 1.50V Dual Channel Desktop Memory Model F3-12800CL10D-16GBXL at Amazon.com