iMac (27-inch, Late 2012) - Technical Specifications
Sabrent Premium 4-Port USB 3.0 Hub for iMac (2012 and later)
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
Apple iMac 27" - Late 2012 Reviews, Pros and Cons | TechSpot
Apple iMac 27-inch (2020) review | TechRadar
New CPUs, faster Wi-Fi, same flaws: Apple's 2013 iMac reviewed | Ars Technica
Satechi Type-C Aluminum Monitor Stand Hub for iMac - Docking station + monitor stand - USB-C - for Apple iMac (Early 2019, Late 2009, Late 2011, Late 2012, Late 2013, Late 2014,
increasing USB ports on iMac late 2012? | MacRumors Forums
Buy 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)
New 21.5-inch iMac now available through Apple's online store, 27-inch models ship in 2-3 weeks - 9to5Mac
Hagibis USB C Clamp Hub Type c for 2021 iMac with USB C USB 3.0 Micro/SD Card Reader 4K HD Docking Station iMac Accessories|USB Hubs| - AliExpress