4GB (2x2GB) DDR3-1066MHZ PC3-8500 2Rx8 SODIMM Laptop Memory by NEMIX RAM at Amazon.com
MicroMemory 4 GB DDR3 1066 MHz SO-DIMM Laptop Memory (DDR3, 0 – 85 °C at Amazon.com
OWC 4GB PC8500 DDR3 1066MHz SO-DIMM Memory Compatible with Early 2009, Early 2010 MacBook, MacBook Pro Unibody Models, 2009/2010 Mac Mini, and 2009 iMac Models at Amazon.com
URAM Laptop Memory 4GB DDR3 1066MHz 1067MHz PC3-8500S Samsung IC RAM SODIMM or Apple Mc, Intel,and AMD Systems at Amazon.com
8GB (2 X 4GB) DDR3 1066MHz PC3-8500 240-pin Memory RAM DIMM for Desktop PC by NEMIX RAM at Amazon.com