Imac 5k 32gb Ram on Sale, SAVE 40% - www.ecomedica.med.ec
Apple Memory Module 32GB DDR4 2400MHz SO-DIMM (2x16GB) - Apple (HK)
iMac 21.5-inch 4K (2017) Review | Trusted Reviews
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
2017 21.5-inch 4K iMac memory upgrade kit includes 32GB of RAM, tools to take it apart | AppleInsider