Top Tier PC3-8500 SO DIMM - 4 GB DDR3 1066MHz | Sweetwater
Memory soDim 4GB DDR3 1066MHz for Macbook and iMac
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