may I also suggest you look at www.manxnotebook.com (I also sell a CD with more land records etc)
The Fam Hist Soc sells CDs of transcriptions of burial registers - if you are into 19th C + later then their very useful transcribed MIs are currently only available as paper copies.
The Manx museum does not sell any fam hist CDs (the museum shop - shop@mnh.gov.im - is well stocked with manx related material + books currently in print (older material can often be found on Manxnotebook) - the library is too short staffed to do any research for you - the www.imuseum.im is their portal to all records currently on line