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
CORSAIR 16GB (2 x 8GB) DDR3 1333 (PC3 10600) Memory for Apple Model CMSA16GX3M2A1333C9 System Specific Memory - Newegg.com
CORSAIR 16GB (2 x 8GB) DDR3 1333 (PC3 10600) Memory for Apple Model CMSA16GX3M2A1333C9 - Walmart.com
Crucial RAM DDR48GB Kit (2 x 4GB) DDR3-1333 SODIMM Memory for Mac CT2K4G3S1339M _ - AliExpress Mobile
Crucial 8GB DDR3L-1333 SODIMM Memory for Mac - CT8G3S1339M" - Walmart.com
Timetec 8GB DDR3-1333 SODIMM for Mac - Timetecinc.com - Memory of Lifetime and Easy Upgrades
CORSAIR 16GB (2 x 8GB) DDR3 1333 (PC3 10600) Memory for Apple Model CMSA16GX3M2A1333C9 System Specific Memory - Newegg.com
32GB (4 x 8GB) PC10600 DDR3 1333MHz SO-DIMMs Memory Compatible with 2011 MacBook Pro, Mid 2010/2011 21.5" & 27" iMac Models, 2011 Mac Mini (OWC1333DDR3S32S) at Amazon.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