16GB Kit 2x 8GB Memory RAM for Apple iMac Mid 2017 Retina 4K iMac18,1 iMac18,2 | eBay
Teardown of New 4K 21.5-inch iMac Reveals Removable RAM and Modular CPU - MacRumors
8GB Kit (2x4GB) for Apple iMac 27-Inch "Core i5" 3.4 5K Mid-2017 Ram Memory | eBay
A-Tech 32GB (2x16GB) RAM for Apple iMac 2017 (27 inch Retina 5K & 21.5 inch Retina 4K) | DDR4 2400MHz SODIMM PC4-19200 2Rx8 1.2V 260-Pin SO-DIMM Memory Upgrade Kit
Amazon.com: OWC 32GB (4x8GB) 2400MHZ DDR4 SO-DIMM PC4-19200 Memory Upgrade Compatible with 2017 iMac 27 inch with Retina 5K Display (OWC2400DDR4S32S) : Everything Else
Upgrade your iMac 27'' 2017 RAM with MrMemory review - Wim Arys
512GB 4X128GB NEMIX RAM Memory for Apple iMac Pro 27-inch Late 2017
How To: Upgrade 2017 5k iMac RAM to 64GB & Saved $840 | 2018 - YouTube
8GB (2X 4GB) Memory for Apple iMac 27" 2017 5K Retina Display DDR4 PC4 2400 RAM | 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
iMac Intel 21.5" Retina 4K Display (2017) RAM and SATA Hard Drive Upgrade - iFixit Repair Guide
32GB 2X16GB NEMIX RAM Memory for Apple iMac 2017 27" Retina 5K - Newegg.com