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
Apple MacBook Pro 15" Mid 2009 Laptop Intel Core 2 Duo 2.53GHz 4GB RAM 320GB HDD | eBay
A-Tech for Apple 4GB Kit (2X 2GB) DDR3 1067MHz / 1066MHz PC3-8500 SODIMM Memory RAM
MacBook 6,1 (13-Inch, Late 2009) - Full Information | iGotOffer
MacBook Pro: How to remove or install memory - Apple Support
Apple MacBook Pro (Mid 2009) 15" Core 2 Duo 2.8GHz 8GB RAM 250GB HDD | eBay
MacBook Pro: How to remove or install memory - Apple Support
8GB of RAM and 5,2 MacBooks (Early or Mid 2009) | MacRumors Forums