My base price for a fondant covered cake is $3/serving. That would be with basic cake flavors and basic fillings. Any extra edible decorations such as flowers, figurines, etc are all extra. I do not do buttercream cakes because I don’t feel I’m good at doing them and I just don’t like to do them. Although, I agree with everyone in that it depends on your area. I live in the country about 30 minutes from any major city so my price aligns pretty well with other local cake bakers… But if I lived 2 hours south of here in Philadelphia, I could easily charge $8+/serving for a fondant cake!