Amazon product: Crucial 32GB Kit (16GB x 2) DDR4 3200 MT/s (PC4-25600) SODIMM 260-Pin Memory – CT2K16G4SFRA32A
Bought 2 of these to upgrade the RAM on my new 2018 Mac Mini to 32GB. Worked perfectly! Install took me about 20min. Lots of videos and tutorials out there on how to do it, just 1 important note before you attempt. You’ll need a T6 security torx to be able to take it apart. This is can be hard to find. I did find a set on amazon that contained the right bit. (You’ll also need a regular T10 torx, but you can get that anywhere).