OWC 16.0GB (4 x 4GB) 1333MHz 204-Pin DDR3 SO-DIMM PC3-10600 CL9 Memory Compatible with iMac (OWC1333DDR3S16S) at Amazon.com
4GB PC10600 DDR3 1333MHz SO-DIMM Memory Compatible with 2011 MacBook Pro, Mid 2010/2011 21.5" & 27" iMac Models, 2011 Mac Mini (OWC1333DDR3S4GB) at Amazon.com
Crucial 8GB DDR3L-1333 SODIMM Memory for Mac - CT8G3S1339M" - Walmart.com
US 8GB 1333MHz DDR3-10600S DDR3 Laptop SDRAM Memory For Macbook Pro 13" 15" 2011 | eBay
16GB Kit 2x8GB 1333MHz DDR3 RAM Memory for MacBook Pro
OWC 32GB (4 x 8GB) PC3-10600 DDR3 ECC-R 1333MHz... at MacSales.com
Mac Pro Memory for Model 5.1 | DDR3 1333MHz | 2GB | MacMemory.com
Crucial 8GB Kit (2 x 4GB) DDR3L-1333 SODIMM Memory for Mac | CT2K4G3S1339M | Crucial.com
Timetec Hynix IC 8GB 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 (8GB) - Walmart.com
Mac Pro Memory for Model 5.1 | DDR3 1333MHz | 2GB | MacMemory.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