iMac (21.5-inch, Late 2015) - Technical Specification
Identify your iMac model - Apple Support
Apple cuts another Intel tie by discontinuing 21.5-inch iMac | Ars Technica
Apple A Grade Desktop Computer iMac 21.5-inch (Retina 4K) 3.4GHZ Quad Core i5 (Mid 2017) MNE02LL/A 8 GB 1 TB HDD 4096 x 2304 Display Mac OS Includes Keyboard and Mouse - Walmart.com
Apple 21.5” IMac | Access
Apple 21.5" iMac® Intel Core i5 (2.3GHz) 8GB Memory 1TB Hard Drive Silver MMQA2LL/A - Best Buy
Apple 21.5 inch iMac Unboxing & Demo (Late 2012) - YouTube
A First Look At The 2012 21.5-inch iMac, And How It Compares To Generations Past | TechCrunch
Apple iMac 21.5-inch with Retina 4K display: Unboxing & Review - YouTube
Apple iMac 21.5-inch: 2.3GHz – UCF Technology Product Center
Configure your own 21.5-inch Apple iMac (2013) at OWC
2010 Apple iMac 21.5" Core i3,16 GB, 512 GB SSD - used - iRedo
Review: 21.5-inch 2012 iMac takes two steps forward, one step back | Ars Technica