Apple iMac 21.5" A1311 -i3 2.5GHz 4GB Ram 250GB MacOS High Sierra (GRADE B) | eBay
A-Tech 4GB RAM for Apple MacBook Pro (Mid 2012), iMac (Late 2012, Early/Late 2013, Late 2014, Mid 2015), Mac Mini (Late 2012) | DDR3 1600MHz PC3-12800 SODIMM 204-Pin Memory Upgrade at Amazon.com