The biggest task there is that there are literally thousands of morphs available. I imagine that a wiki-type page might work, or perhaps we could petition the people over at WoBP to add a pricing option to the bottom of each page? Either way, I agree such a thing would be really helpful.
It would also help if someone could come up with a formula of some kind for adding in multiple genes, which isn't always just adding in the total cost of the morphs present.