Here is my Cost Calculator (
http://xenocidius.webs.com/costcalculator/).
At the moment it's a bit rough; it automatically downgrades the deck you input. When I have time I'll make it work for upgraded decks too, but for now it works for the tourney.
Note that this uses the buying price of rares, not the selling price. So the rules will have to be changed for it to be of any use, unfortunately.
EDIT: Rules changed. Aye.