Integral RAM 16GB kit (2x8GB) DDR4 2666MHz SODIMM Laptop Notebook MacBook Memory at Amazon.com
OWC 16GB (2 x 8GB) PC21300 DDR4 2666MHz SO-DIMMs Memory Compatible with Mac Mini 2018, iMac 2019 and up, and Compatible PCs (OWC2666DDR4S16P) at Amazon.com