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 Trident Z Royal Series [Silver] 32GB (2 x 16GB) 288-Pin SDRAM (PC4-28800) DDR4 3600 CL19-20-20-40 1.35V Dual Channel Desktop Memory Model F4-3600C19D-32GTRS at Amazon.com
Lenovo 32GB DDR4 SDRAM Memory Module at Amazon.com
G.Skill Trident Z RGB Series 32GB (2 x 16GB) 288-Pin SDRAM (PC4-25600) DDR4 3200 CL16-18-18-38 1.35V Dual Channel Desktop Memory Model F4-3200C16D-32GTZR at Amazon.com