AliExpress
Amazon.com: Hagibis iMac Hub with 1000Mbps RJ45, USB C 3.1, USB 3.0 Ports and SD/Micro SD Card Reader, USB-C Clamp Hub USB C Docking Station for 2021 iMac 24 inch (with RJ45) :
USB 3.0 speeds on late 2012 iMac | MacRumors Forums
Review: 21.5-inch 2012 iMac takes two steps forward, one step back | Ars Technica
Review: 21.5-inch 2012 iMac takes two steps forward, one step back | Ars Technica
Aluminum alloy usb 3.0 hub 3 port adapter splitter with SD/TF Card Reader for iMac 21.5 27 PRO Slim Unibody computer
Fix Any Slow iMac 2012-2020 - Install SSD Externally - YouTube
HUWEI Aluminum alloy USB 3.0 HUB 3 port adapter splitter with SD/TF Card Reader For iMac 21.5 27 PRO Slim Unibody computer|USB Hubs| - AliExpress
Sabrent Premium 4-Port USB 3.0 Hub for iMac (2012 and later)
Sabrent Premium 4-Port USB 3.0 Hub for iMac (2012 and later)
Amazon.com: OWC 1.0TB SSD Upgrade Bundle for 2012-2017 iMacs, 1.0TB Extreme Pro 6G SSD, Express 2.5" USB 3.0 HDD Enclosure, Installation Tools and iMac Screen Adhesive Tape Set : Electronics
Satechi USB-C iMac 2017 Clamp Hub Pro Multi-Port Adapter - Silver
Review: 21.5-inch 2012 iMac takes two steps forward, one step back | Ars Technica
Mac accessories Archives - Connecting Point
Amazon.com: Aluratek USB 3.0 Port Extender for iMac (AUHM0301F) : Electronics
Review: 21.5-inch 2012 iMac takes two steps forward, one step back | Ars Technica
iHouse - Apple Authorized Reseller | Rocketek USB 3.0 Aluminum 4 port hub for iMac 2012-2017
AliExpress
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
OWC Envoy Pro USB 2.0/3.0 Enclosure for... at MacSales.com
