[jiaaro]

but the RAM is just plain old laptop RAM. You can buy it from anywhere.

Similar to the external hard drive market, anything labeled "apple compatible" costs extra, but is basically the same thing.

Find the RAM you machine needs, and search for that directly on Newegg or similar.

How to find what RAM you need: (on OSX Lion)

  1. Click the Apple (top left corner of your screen)  
  2. Click "About this Mac"  
  3. Click "More Info..."  
  4. Click the "Memory" tab

Note: there are memory upgrade instructions in this window as well :)