Apple MacBook 13" (Early 2008) 2.1 GHz Core 2 Duo 1 GB RAM A1181 | eBay
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
How to Upgrade Mac Pro Memory (MacPro1,1/MacPro2,1): EveryMac.com
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Memory for Apple Macbook and Macbook Pro MidLate 2007 Early 2008 Ram A1226 A1229 A1181 MA897LLA MA896LL MA895LL MC240LLA MB881LLA MB404LLA MB403LLA MB402LLA MB063LLB MB062LLB MB061LLB Toy Parts & Accessories - Newegg.com
MacBook Pro Memory Upgrade Kits (2008, 2009 and 2010)