hard drive recovery?

So, I have an old western digital "mybookworld" NAS, and it's toast. I don't recall if it was set up for RAID0 or RAID1. I would like some of the files that were on there. Anyone have experience with data recover folks? Any idea what something like this might cost? I don't have much experience with this sort of thing myself, so I'm hesitant to open it up and fuck with it because I don't want to break things worse in my attempt to unbreak them.