CD-RW drive for the Cube?

[Nicolai Sidenius]

I have a Cube with the usual CD/DVD drive installed. I never use DVDs 
but really badly need a CD-burner. Can anybody tell where I can get a 
simple, and preferably fast, CD-RW drive for the Cube? Because of their 
high prize I'm not really interested in the combo and super drives. 
Also, I don't want an external drive for estetical reasons. I 
understand that drives which fit in the iMac (slot loading) will also 
fit in the Cube, but also these I cannot seem to find around....
Thanx,
Nicolai Sidenius