Crucial 16GB Kit (8GBx2) DDR4 2400 MT/s (PC4-19200) DR x8 SODIMM 260-Pin Memory - CT2K8G4SFD824A at Amazon.com
Corsair Memory Kit 16GB (2x8GB) DDR4 2400MHz SODIMM Memory, (2 x 8GB) at Amazon.com
Crucial 16GB Kit (8GBx2) DDR4 2400 MT/s (PC4-19200) SR x8 SODIMM 260-Pin for Mac - CT2K8G4S24AM
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 SO-DIMM Series 32GB (2 x 16GB) 260-Pin (PC4-19200) DDR4 2400 CL16-16-16-39 1.20V SO-DIMM Memory Model F4-2400C16D-32GRS at Amazon.com