Amazon.com: Timetec 16GB KIT(2x8GB) Compatible for Apple DDR3 1333MHz PC3-10600 CL9 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) MAC RAM Upgrade :
Komputerbay 16GB (4 X 4GB) DDR3 DIMM (240 pin) 1333Mhz PC3 10600 / PC3 10666 16 GB KIT at Amazon.com
Xtremeram Apple Compatible Memory Module 8GB 1333MHz DDR3 (PC3-10600) - 2x4GB at Amazon.com