CORSAIR VENGEANCE LPX 64GB (2PK x 32GB) 3200MHz DDR4 C16 DIMM Desktop Memory Black CMK64GX4M2E3200C16 - Best Buy
DATARAM 64GB (2 x 32GB) 2666MHz DDR4 PC4-21300 SO-DIMM 260 Pin Memory Upgrade for 2018 Mac Mini (macmini18,1), 2019 27 inch iMac (iMac19,1) and PC laptops at Amazon.com
G.SKILL Ripjaws Series 64GB (2 x 32GB) 260-Pin DDR4 SO-DIMM DDR4 3200 (PC4 25600) Laptop Memory Model F4-3200C22D-64GRS - Newegg.com