I don't know of any other source. I have one single issue in storage. When I manage to get some money I plan on collecting them all. I saw the Ghostbusters 2 one on ebay recently and almost bought it thinking I could offer up a scan for this project (which I can't wait to see finished btw).

I would love to help contribute an isolated score (I have the official score CD) but I don't have the NTSC version of Ghostbusters. I also used to have a CD-R of the bootleg score (which might contain material not available on the commercial CD but I doubt it) and unfortunately I don't own the official song soundtrack CD. If I had that CD and the NTSC Ghostbusters I'd love to do an isolated score for you to provide on the DVD as a DVD-ROM extra which people could then author onto backups of their own official Ghostbusters DVDs.