I received a few Navy reports through Accident-Reports.com, and couldn't have been happier.
http://www.accident-report.com/
Mr. Robbins, who handled my reports (and I think handles all Navy reports for the site) was extremely helpful and did an excellent job. For my reports all I was able to provide was a vague type (PBM), area (Truk Lagoon), and general time period (Fall 1946). Mr. Robbins was able to find the reports I was looking for.
He didn't stop there either. when I began having doubts that I had the reports I needed, he looked into it again. He got back to me confirming that they were the only reports for that aircraft type in that area, ever.
He also assisted me when there were portions of the reports that were unreadable and explained some very important information contained in the report that I would have never understood.
The reports were a little more expensive than $5. The one I received were $15 each. However the assistance and support I received were priceless. I would highly recommend them, and without a doubt, will use them again next time.