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
OWC 32GB (2 x 16GB) 2400MHZ DDR4 SO-DIMM PC4-19200 Memory Upgrade For 2017 iMac 27 inch with Retina 5K display - Newegg.com
Memory Upgrades for 2017 iMac 27-Inch
Base model iMac Pro teardown sheds more light on its upgrade potential - 9to5Mac
OWC Confirms New Low-End 27-inch iMac Can Be Fitted With 64GB RAM - MacRumors
64GB RAM upgrade kit for 21.5-inch iMAC now offered by OWC - 9to5Mac
OWC Confirms 64GB of RAM in Apple 27" iMac 2017
64GB OWC Memory Upgrade Kit for 27-Inch Apple iMac 2017
Upgrade your iMac with OWC, 2017 4K Retina Edition | TweakTown
OWC OWC2400DDR4S16P Owc 16Gb (2 X 8Gb) Pc19200 Ddr4 2400Mhz So-Dimms Memory Compatible With 27" Imac W/Retina 5K (Mid 2017), Mac Mini (Late 2018), A