Beccy, the films can be seen through LDS Family History Centres or at the Manx Museum library. It is unlikely that anyone would have complete photocopies because there are dozens of films, and it is a slow process going through even one of them. - Have a look at the LDS catalogue on FamilySearch for listings.
The easiest one to use is probably the Composition Book 1643-1703 which is a transcript and therefore clearer to read. In the Manx Museum it has the film numbers RC1 and RC2, but strangely the LDS have renamed it "Transcript of Manor Rolls 1643-1700" [film no 106649].
Nigel Crowe has a survey of Douglas on his website: http://www.manxroots.com/dgls/openme.htm
Sue