4GB [2x2GB] DDR2-800 (PC2-6400) RAM Memory Upgrade Kit for The Apple MacBook 13.3" 2.13GHz Core 2 Duo 5,2 MC240LL/A (Genuine A-Tech Brand) at Amazon.com
Intel Core 2 Duo E6420 (HH80557PH0464M) SLA4T 2.13 GHz LGA 775 CPU 1066MHz 9521200154047 | eBay
Intel Core 2 Duo E6400 - HH80557PH0462M / BX80557E6400