Used Apple iMac Pro 27-inch (Retina 5K) 3.0GHZ 10-Core Xeon (Late 2017) MHLV3LL/A - GainSaver
Help with imac 2017 connections | MacRumors Forums
Amazon.com: SABRENT Multi Port iMac Hub with Front Access USB Ports, SD/Micro SD Card Reader, 3.5mm Headphone Jack and Rear HDMI 2.0 Output (iMac 2017 to 2020) (HB-SIMC) : Everything Else
Amazon.com: Satechi Aluminum Type-C Clamp Hub Pro with USB-C Data Port, USB-A 3.0 Data, Micro/SD Card Reader - Compatible with 2020/2019/2017 iMac & iMac Pro, Does Not Fit 2021 iMac (Silver) :
2016 Macbook Pro with old USB 3 | MacRumors Forums
Recommended for 21.5" iMac with Retina 4K Display (Mid 2017) by Apple - GTrusted
Apple iMac 21.5-Inch With 4K Retina Display (2017) Review | PCMag