Price Builder Calculator for Rapidweaver?

Hi there,

Does anybody know if there is a price builder calculator stack or Add-on available for rapid weaver? Think of building a sandwich, you start from point A and end up at point Z, depending on what you added for fillings etc the price changes with each step you take, you’d be able to change prices for each filming etc…

Another example here: http://www.duplicationcentre.co.uk/prices.html