New Genuine Memory for ThinkPad 4GB DDR4 2400 SoDIMM Memory 01HW756 at Amazon.com
Apple OEM Memory / Micron 4GB DDR4 2666MHz SODIMM Memory Module at Amazon .com
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