Unless things have changed you can either visit the Registry, or contact them via their website to order a copy of the will: http://www.gov.im/registries/general/deedsandpro.xml

They will give you the price which, unless this has changed, is the same as sending someone else to buy it on the spot - two visits, to order and collect.
You then send them the amount payable and they will post you the will.

Sue