How to upgrade RAM in the (Mid 2017) 5K iMac and save up to ~$900 [Video] - 9to5Mac
Memory Upgrades for 2017 iMac 27-Inch
Amazon.com: 2017 Apple iMac with Intel Core i5 (21.5-inch, 8GB RAM, 1TB Storage) - Silver (Renewed) : Electronics
2020 5K iMac RAM Upgrade Guide - Save $2100 on 128GB! - YouTube
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
6 Best RAMs for iMac in 2023: Best Deals for Any Purpose
iMac 21.5-inch 4K (2017) Review | Trusted Reviews
iMac Pro: Discontinued! Don't Buy an iMac Pro
Apple iMac 27-Inch With 5K Retina Display (2017) Review | PCMag