I don't think there is much you can do for yourself on this one.
The only place I would suggest is "ontrack.com".
I have had them retrieve data before, of the 4 data retrieval services I have used they seem to be by far the best equipped.
Of course, the data needs to be real important because they do charge.
I think it's about $300 to start, and goes up from there.
(you will need to call them to verify.)