Sorry byrnekj, you're getting some frivolous responses (including mine!) to a serious post. As a rule any post regarding hard info on cubans is going to meet similar responses. I have no real information to provide as I am in a position to obtain ISOMs, legally, in person, outside the US in my travels. And I understand that you would like to benefit from the experience of others in terms of reasonable prices, avoiding fakes/ripoffs, etc. You need to correspond regarding this matter with individual emails only, and I think you'll find that most folks will provide you with the benefit of their experiences.
Assuming, of course, hypothetically, that they have any experiences!