A-Tech 4GB RAM for Apple MacBook Pro (Early/Late 2011), iMac (Mid 2010, Mid 2011, Late 2011), Mac Mini (Mid 2011) | DDR3 1333MHz PC3-10600 204-Pin SODIMM Memory Upgrade Module at Amazon.com
Apple iMac 21.5" 2.7GHz Core i5 Quad-Core 4GB Ram 1TB HD All-In-One-MC812LL/A - USED - Walmart.com