Apple MacBook Air 13-inch 4,2 MD226LL/A Laptop Core i7 4GB RAM 120GB SSD MacOS Mid 2011 With Multiple Accessories Refurbished Grade B - Walmart.com
A-Tech 16GB (2x8GB) RAM for Apple MacBook Pro (Early/Late 2011), iMac (Mid 2010 27 inch 4-Core, Mid 2011 21.5/27 inch), Mac Mini (Mid 2011) | DDR3 1333MHz PC3-10600 204-Pin SODIMM Memory Upgrade Kit at Amazon.com
Amazon.com: Timetec 8GB KIT(2x4GB) Compatible for Apple DDR3 1333MHz PC3-10600 for Mac Book Pro (Early/Late 2011 13/15/17 inch), iMac (Mid 2010, Mid/Late 2011 21.5/27 inch), Mac Mini(Mid 2011) RAM Upgrade : Electronics
How to Upgrade MacBook Pro RAM (2009, 2010, 2011, 2012): EveryMac.com
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SOLVED: Upgrading Memory on MacBook Air 2011 11 inch Model - MacBook Air 11" Mid 2011 - iFixit
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NEMIX RAM 16GB SODIMM Memory Upgrade (2x8GB) DDR3 1333MHz PC3-10600 CL9 Compatible for Apple Mac Book Pro (Early/Late 2011 13/15/17 inch) at Amazon.com
MacBook Pro 13" Unibody (Late 2011) Memory Maxxer RAM Upgrade Kit - iFixit Store
Amazon.com: Timetec 8GB KIT(2x4GB) Compatible for Apple DDR3 1333MHz PC3-10600 for Mac Book Pro (Early/Late 2011 13/15/17 inch), iMac (Mid 2010, Mid/Late 2011 21.5/27 inch), Mac Mini(Mid 2011) RAM Upgrade : Electronics