dont know what the cost is, but It is def big enough to split! last summer we split it between two teenagers and a very pregnant aunt of mine! it was excellent.
The menu from DIS says: Sparkling Volcano - Enough for 2 or more people! Giant rich chocolate brownie cake stacked up high, served warm with vanilla ice cream, fresh whipped cream, and topped with caramel and chocolate sauces. - $12.99