8GB (2x4GB) DDR3-1066MHZ PC3-8500 2Rx8 SODIMM Laptop Memory at Amazon.com
2 x 4.0GB PC8500 DDR3 1066MHz 204 Pin - Walmart.com
Apple Memory Module 8GB 1066MHz DDR3 (PC3-8500) - 2x4GB SO-DIMMs at Amazon .com
KOMPUTERBAY 8GB (2X 4GB) DDR3 SODIMM (204 pin) Made with Hynix semiconductors 1066Mhz PC3 8500 for Apple 8 GB with SODIMM Heatsink for Extra Cooling at Amazon.com