Copies of the actual census material are only available for purchase from the PRO at Kew.
Transcriptions of the 1881 census are available from the LDS on CD or fiche.
The IoM FHS has published transcripts of the 1851 and 1881 census by parish.

I have available printed indices to the 1841-71 and 1891 censuses for the whole Island. Cost per index is US$50.00 by surface mail, US$60.00 by airmail.

Contact me direct for further details and prices in other currencies.