Wait, which films do you have? 'Cause I am starting a Trek rarities blog soon and those would be an interesting resource, if you had some way of sending them.
I meant I already have on VHS many of the workprints that can be found on the website you indicated (http://workprints.biz
- Star Trek Generations
- Blade Runner
- Alien 3
And some more...
I don't have any other Star Trek workrpint (and I don't think any other is available among collectors).