iMac Ejecting All Discs (Out of Warranty)

[ColinEC]

My first-gen Intel iMac is rejecting discs (both CDs and DVDs).

I don't have enough money to take this to the Apple Store (it's out of warranty, too expensive and I'm trying to save for a new MBP), could you guys recommend a new replacement SuperDrive that I can install myself?

My system:

iMac Intel Core Duo 2GHz
2GB RAM
x1600 256MB
250GB HD

The drive that's giving me problems:
MATSHITA DVD-R UJ-846

[forgottensoft]

You'll need a slot load slim drive. I would suggest just getting an external. They can be found for relatively cheap.