parts-quick 8GB Memory for Dell OptiPlex 3050 SFF/Tower DDR4 2400MHz Dual-Channel Non ECC SDRAM DIMM at Amazon.com
G.Skill Ripjaws SO-DIMM 8 GB DDR4 2400 MHz C 16 1.2 V Laptop 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