How much does fondant icing cost?

I have no idea about the cost of fondant. However, you can make an at-home version of fondant by melting icing to a liquidey consistency or by applying icing as it is from the tub to a still-hot cake. This will cause the icing to melt, but as you layer it, it will cool and form an icing that is more consistent with fondant, than the thick spread that is usually on cake.