Refurbished Apple iMac 13,1/i5-3330S/8GB RAM/1TB HDD/GT 640M/21.5-inch/B ( Late - 2012) | Mac4sale
Install memory in an iMac - Apple Support
Memory upgrade: Apple iMac 2012/2013/2014 (Howto)
All in one computer Apple iMac 21.5" mid 2011 - 1tb Hdd 8GB Ram Intel Core i5 | eBay
Install memory in an iMac - Apple Support
Apple iMac Late 2012 21.5-inch 2.7 GHz Core i5 Desktop DDR3 RAM Memory | Kingston
Timetec Hynix IC Apple 8GB Kit (2x4GB) DDR3L 1600MHz PC3L-12800 SODIMM Memory Upgrade For MacBook Pro 13-inch/15-inch Mid 2012, iMac 21.5-inch Late 2012/Early 2013 (Low Density 8GB Kit (2x4GB)) : Amazon.co.uk: PC