8GB 2x4GB DDR3 Memory For MacBook Pro 13" Mid 2009 / 2010 MB990LL/A MC374LLA IT | eBay
16GB (2 x 8GB) 204-Pin DDR3 SO-DIMM DDR3 1600 (PC3 12800) Laptop Memory Model M471B1G73CB0-CK0 - Newegg.com
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4GB (1x4GB) DDR3-1333MHz PC3-10600 2Rx8 SODIMM Laptop Memory by NEMIX RAM at Amazon.com
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Timetec Hynix IC 4GB Compatible for Apple DDR3 1333MHz PC3-10600 SODIMM Memory for Early/Late 2011 13/15/17 inch MacBook Pro, Mid 2010 and Mid/ Late 2011 21.5/27 inch iMac, Mid 2011 Mac Mini (4GB) - Newegg.com