Amazon.com: OWC 8GB (2 x 4GB) PC19200 DDR4 2400MHz SO-DIMMs Memory Compatible with Mac Mini (Late 2018), 27" and 21.5" iMac (Mid 2017), and Compatible PCs (OWC2400DDR4S08P) : Everything Else
Axiom 4GB DDR4-2666 SODIMM for Lenovo - 4X70R38789 at Amazon.com
4GB (1x4GB) DDR4-2400MHz PC4-19200 1.2V SODIMM Memory for Laptop by NEMIX RAM at Amazon.com
Timetec 4GB DDR4 2400MHz PC4-19200 Non-ECC Unbuffered 1.2V CL17 1Rx8 Single Rank 260 Pin SODIMM Laptop Notebook PC Computer Memory RAM Module Upgrade ( 4GB) at Amazon.com