The Devon Family History Society - http://www.devonfhs.org.ukhttp://www.devonfhs.org.uk - offers a surname search for Marriages 1754 to 1812 and 1813 to 1837. Also burials from 1813 to 1837. You don't have to be a member. You can ask for a search via their web site and in turn they will send you a quote which you can then use as an order to be sent by post - ask them how the currency difference is resolved.
As of today (Jan 3, 2002) the rate of exchange is £1.00 = US$1.44 or CAN$2.30