G.SKILL Ripjaws Series 32GB DDR4 3200 Laptop Memory - Newegg.com
Premier DDR4 3200 U-DIMM RAM Memory | ADATA
OWC 64GB (2 x 32GB) PC21300 DDR4 2666MHz SO-DIMMs Memory Compatible with Mac Mini 2018, iMac 2019 and up, Dell, HP, Lenovo, ASUS and Compatible PCs (OWC2666DDR4S64P) at Amazon.com
DDR4 R-DIMM-TEAMGROUP
CORSAIR Vengeance RGB PRO 16GB (2PK x 8GB) 3200MHz DDR4 C16 DIMM Desktop Memory Black CMW16GX4M2C3200C16 - Best Buy
Amazon.com: OWC 64GB (4 x 16GB) PC19200 DDR4 2400MHz SO-DIMMs Memory Compatible with 27" iMac (Mid 2017), and Compatible PCs (OWC2400DDR4S64S) : Everything Else