CMS 32GB (4X8GB) DDR3 12800 1600MHz Non ECC SODIMM Memory Ram Upgrade Compatible with Apple® iMac Core I7 3.4 27-Inch (Late 2012) - A6 at Amazon.com
iMac RAM for Model 13.2 to 15.1| DDR3-1600MHz | 4GBx2 | MacMemory.com
Review: 21.5-inch 2012 iMac takes two steps forward, one step back | Ars Technica
Apple iMac Late 2012 21.5-inch 2.7 GHz Core i5 Desktop DDR3 RAM Memory | Kingston
Apple's 27" iMac Late 2012 model. How to upgrade the ram to 16GB - YouTube
Install memory in an iMac - Apple Support
NEMIX RAM 16GB Kit (2x8GB Upgrade) DDR3-1600 SODIMM PC3-12800 for Apple MacBook Pro Mid 2012 / iMac Late 2012 / iMac 2013, Late 2014, Mid 2015, Mac Mini Late 2012 at Amazon.com
Install memory in an iMac - Apple Support
Restored Apple iMac 21.5-inch 2.7GHZ Quad Core i5 (Late 2012) MD093LL/A 8 GB DDR4 1 TB HDD 1920 x 1080 Display Sierra 10.12 Includes Keyboard and Mouse (Refurbished) - Walmart.com
iMac RAM for Model 13.2 to 15.1| DDR3-1600MHz | 8GBx4 | MacMemory.com
Timetec 16GB KIT(2x8GB) Compatible for Apple DDR3L 1600MHz for Mac Book Pro(Early/Late 2011,Mid 2012), iMac(Mid 2011,Late 2012,Early/Late 2013,Late 2014,Mid 2015), Mac Mini(Mid 2011,Late 2012) MAC RAM at Amazon.com
Apple iMac Late 2012 21.5” Intel Core i5 2.70GHz 8GB RAM 1TB HD Catalina 10.15 | eBay
iMac | 2.9 GHz Intel i5 | 27 Inch | Late 2012 - Techable.com