Why is this Movie so Hard to Find?

I have a copy of this film on DVD (don't ask, it's from e-bay) and I thought it was fairly good. Here is why I think it is so hard to find.

1) Sunset Boulevard came out earlier the same year. People who saw this film may have expected more from the stars than they could give to their roles.

2) DOA also came out earlier the same year and was done by the same director. Again, people could have expected this film to be something it is not.

My only complaint about the movie is that it could use a little more incidental music. I think it is a great thriller, though.