have a look on
dabs.com - PC Hardware, Components, Software, Digital Cameras, MP3 Players Overclockers.com----- (or uk cant remember)
there are loads a plug in ones on there..
i got a seagate external drive 250gig and used an old case that i had to house it.. fookin mint.. everythin i have is on there now.. nowt is stored in me pc for long...