MacBook Pro 15" Unibody Late 2008 and Early 2009 RAM Replacement - iFixit Repair Guide
4GB Memory for Apple Macbook and Macbook Pro Mid/Late 2007 Early 2008 Ram A1226 A1229 A1181 MA897LL/A MA896LL MA895LL MC240LL/A MB881LL/A MB404LL/A MB403LL/A MB402LL/A MB063LL/B MB062LL/B MB061LL/B at Amazon.com
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upgrade - RAM for late 2008 Macbook? - Ask Different
MacBook Pro: How to remove or install memory - Apple Support
4GB Memory for 2006-2008 MacBook Pro and iMac
MacBook Pro: How to remove or install memory - Apple Support
MacBook Pro Memory Upgrade Kits (2008, 2009 and 2010)
4GB 2X2GB Apple MacBook Pro Late 2008-2010 Memory
MacBookPro 13" Memory Upgrade Sale
MacBook Pro: How to remove or install memory - Apple Support
Apple MacBook Pro 2007 (Mid) 15-inch 17-inch MacBookPro3,1 SSD RAM OSX UPGRADE - ZD Laptop Service Centre
Timetec 8GB KIT(2x4GB) Compatible for Apple DDR3 1067MHz / 1066MHz PC3-8500 CL7 for Mac Book, Mac Book Pro, iMac, Mac Mini (Late 2008, Early/Mid/Late 2009, Mid 2010) SODIMM Memory MAC RAM Upgrade
Timetec 8GB KIT(2x4GB) Compatible for Apple DDR3 1067MHz / 1066MHz PC3-8500 CL7 for Mac Book,
How to Upgrade MacBook RAM (13-Inch Aluminum Unibody): EveryMac.com
A-Tech for Apple 6GB Kit (1x2GB 1x4GB) DDR2 667MHz PC2-5300 200-pin SODIMM for MacBook (Late 2007, Early 2008, Early 2009), MacBook Pro (Mid 2007, Early 2008), iMac (Mid 2007) - Memory RAM Upgrade at Amazon.com
Max RAM on late 2008 MacBook Pro | MacRumors Forums