Clever Kickstarter project puts a USB port on the front of your iMac - 9to5Mac
Jimi provides easier access to iMac USB connectors - The Gadgeteer
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iMac (Retina 5K, 27-inch, Late 2014) - Technical Specifications
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Apple iMac (21.5-inch, 2014) review: A price cut for the 21-inch iMac makes it a mainstream machine - CNET
iMac 27-Inch "Core i5" 3.5 (5K, Late 2014) Specs (Retina 5K, Late 2014, MF886LL/A, iMac15,1, A1419, 2806): EveryMac.com
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increasing USB ports on iMac late 2012? | MacRumors Forums
Apple 27" iMac with Retina 5K Display (Late 2014) MF886LL/A B&H
iMac (Retina 5K, 27-inch, Late 2014) - Technical Specifications
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iMac - 9to5Mac
Best USB Hubs for Your Mac | iMore
Best USB 3/USB-C Hubs for Aluminum iMac Tapered Edge: EveryMac.com
Adding USB3.0 to late 2009 iMac (11,1) | MacRumors Forums
CES 2014: CableCore Hub puts your iMac's USB ports within arm's reach - 9to5Mac