OWC 6GB (2GB + 4GB) PC8500 DDR3 1066MHz SO-DIMMs Memory Compatible with Late 2008, Early 2009, Early 2010 MacBook, MacBook Pro Unibody Models, 2009/2010 Mac Mini, 2009 iMac Models at Amazon.com
Kingston 6GB (3 x 2GB) DDR3 1333 (PC3 10600) Triple Channel Kit Desktop Memory Model KVR1333D3N9K3/6G Desktop Memory - Newegg.com