2017 Apple iMac Pro 18-core 2.3GHz / 256GB RAM / 4TB SSD / Vega 64 16GB | eBay
16GB 2X8GB NEMIX RAM Memory for Apple iMac 2017 27" Retina 5K - Newegg.com
Apple iMac 27 Inch 5K 3.4 GHz Core i5 256GB SSD 16GB RAM 2017 | eBay
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