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
32GB Kit 2x16GB DDR4-3200 PC4-25600 ECC 2Rx8 Unbuffered Server Memory by NEMIX RAM at Amazon.com
CORSAIR Vengeance PRO 32GB (2PK x 16GB) 3200MHz DDR4 C16 DIMM Desktop Memory RGB Black CMW32GX4M2C3200C16 - Best Buy