Corsair Mac Memory 4GB PC2-5300 667MHz 200-Pin DDR2 SODIMM Memory for only $20.49 after Rebate, Shipped FREE!
Here is a GREAT 4GB memory kit for laptop computers. Despite the description, it will work for most notebook PCs, as well as MOST Macs. If you are purchasing for a Mac, make sure your Macbook takes DDR2 instead of the new DDR3 memory (the new MacBook Pro's take DDR3).
Other than that, this kit is high quality and a GREAT price for both Mac and PCs! CORSAIR 200-PIN 4GB PC2-5300 DDR2 SODIMM NOTEBOOK MEMORY DEAL