I would have charged $50 for the cake. But that is what my area of the country can handle. Some areas less, others more.
Depending on how much time/money you have for fondant I would suggest Massa Grischuna Neutral found at http://www.auiswisscatalogue.com/505023.html
I have used several different types of fondant, even made my own for a while, and this is by far the best.
Now, for a few suggestions:
1. Intead of buttercream try icing your fondant covered cakes in...