6.0GB 2GB+4GB MacBook 6,1 (Late 2009) Compatible Memory for DDR3 1066Mhz PC3 8500 SODIMM by NEMIX RAM at Amazon.com
Amazon.com: OWC 2GB PC8500 DDR3 1066MHz SO-DIMM Memory Compatible with Late 2008, Early 2009, Early 2010 MacBook, MacBook Pro Unibody Models, Late 2009 MacBook, 2009/2010 Mac Mini, & 2009 iMac : Everything Else