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
16GB 4x4GB Memory RAM for the Apple iMac DDR3-1333 MHz | eBay
OWC, PC10600, 64GB, Set (4x 16GB), 1333MHz DDR3 ECC-R SDRAM | Melrose Mac
imac memory "ddr3 1333mhz" | Newegg.com
imac memory "ddr3 1333mhz" | Newegg.com
New 16GB 4x4GB Memory RAM for Apple iMac DDR3-1333 MHz at Amazon.com