Archdeaconry and Consistory Courts of Canterbury
These wills, inventories and accounts are held at Maidstone in the Centre for Kentish Studies (CKS). They can be viewed on film and prints taken. Some of the films are of poor quality while others are excellent. I have always found the staff there exceptionally helpful. If you intend to visit the CKS, have a look at their website first. You will need a readers ticket and to book a seat in the film room.
Copies of the film are also held at the Canterbury Archives and at the Society of Genealogist. The Family History Library of the IGI also has copies of these films and you should be able to view these at your local Family History Centre.
There are also possibilities of finding some of these wills online. The Kent Archaeology Society has transcriptions of some Medieval and Tudor wills online including 16 for Staplehurst. These are particularly useful as these very early wills were often in Latin. The Kent Genealogy site has an increasing number of will transcriptions.

For those unable to use any of the above facilities to get copies, the CKS will create copies for you or you can visit my personal website for details on lookups done.