Restored Apple Mackbook Pro Laptop, 13.3", Intel Core i5-3210M, 4GB RAM, 500GB SSD, Windows, Silver, MD101LL/A (Refurbished) - Walmart.com
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
Is RAM from a 2011 MacBook Pro compatible with Mid 2012 MacBook Pro? | MacRumors Forums
NEMIX RAM 16GB (2x8GB Upgrade) DDR3-1333 PC3-10600 204-Pin SODIMM Memory for Apple MacBook Pro Early/Late 2011, iMac Mid 2010 27 inch 4-Core, iMac Mid 2011 21.5/27” , Mac Mini Mid 2011 at Amazon.com