[EricH]

Seeing as you already have the CD-drive motors, you should be able to use those. Mounting and gearing, though, are for you to figure out (hint: glue might work pretty well for mounting, depending on type).

You could also check a local RadioShack to see if they have small motors--there are some decent ones, if you get the "hobbyist" type of RadioShack instead of the "consumer electronics" type.