Guide to Mac, iPad, iPhone ports: Lightning, USB-C, Thunderbolt & more | Macworld
Sabrent Premium 4-Port USB 3.0 Hub for iMac (2012 and later)
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) :
USB-C and Thunderbolt: Understanding Ports and Cables for Macs and iPads - The Mac Security Blog
Amazon.com: SABRENT 4-Port USB 3.0 Hub for iMac Slim Uni-Body (HB-IMCU) : Electronics
Amazon.com: Anker 535 USB C Hub (5-in-1), with 2 USB-A 10 Gbps Data Ports, USB-C 10 Gbps Port, SD and microSD Card Reader, for iMac Pro / iMac 24 inch 2021 / iMac 27 inch / 21.5 inch : Electronics
Take a tour: iMac - Apple Support
HYPER HYPERDRIVE 5-in-1 USB Hub for iMac 24" HD34A6 B&H Photo
USB-C Clamp Hub for 24-inch iMac
Anker 535 USB-C Hub (5-in-1, for iMac) - Anker US
4-Port USB 3.0 Hub For iMac - Sabrent
Sabrent HB-SIMC Multi-Port USB 3.0 iMac Hub at MacSales.com
HyperDrive 6-in-1 USB-C Hub for iMac 24″ – HyperShop.com
Satechi 6-in-1 USB Type-C Hub Clamp for 24" iMac (Blue)
How to fix a Mac USB port that isn't working | Macworld
Amazon.com: USB C Hub for iMac 24 inch 2021, Minisopuru USB Hub Adapter Support M.2 NVMe SSD, iMac USB Hub, 7 in 1 iMac Accessories with USB C 10Gbps, USB A 3.2,
Amazon.com: HyperDrive iMac USB Hub Adapter, 6in1 iMac Accessories: HDMI 4K60Hz, USB-C 10Gbps, 2 USB-A 10Gbps, SD UHS-I, MicroSD UHS-I for iMac 2021 24 inch : Electronics
Amazon.com: Hagibis iMac Hub with 4K@60Hz HDMI, 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 HDMI) :
The new iMac's paltry port selection doesn't bode well for the next MacBook Pro | Engadget
Expand your iMac 24” connectivity with a front-facing USB hub that matches your Apple device color! - Yanko Design
Hyper unveils new clamp-style USB-C hubs for 24-inch M1 iMac in matching colors - 9to5Mac