Kingston 4 GB Apple SODIMM iMac and MacBook Memory (Kit of 2) KTA-MB800K2/4G at Amazon.com
How (And Why) To Install More RAM In Your iMac
New Sandisk SSD Plus on 2011 Macbook Pro … - Apple Community
OWC 8GB (2 x 4GB) PC12800 DDR3L 1600MHz SO-DIMMs Memory Compatible with 2011-2015 iMac, 2011-12 Mac Mini, and 2011-2012 MacBook Pro (Non-Retina Display) Models (OWC1600DDR3S08S) at Amazon.com