I just upgraded the RAM in my Macbook Pro. If your Macbook only has 2 GB of RAM and you want to upgrade to 4 GB, these two sticks of RAM will do the trick for you.

Two sticks of hynix brand RAM with 2 GB each (total of 4 GB).

• Double Data Rate Small Outline Dual Inline Memory Module (DDR3) format
• 30mm (1.18 inch)
• 2 GB or 4 GB
• 204-pin
• PC3-8500 DDR3 1066 MHz type RAM

$20 for the pair - available for pick up on campus.