Is there a plugin for either WooCommerce or WP E-commerce that allows for product configuration? Or are there any tips for building such a thing using Gravity Forms or something like it, that could integrate with one of those?
For example: A store that sells flooring would allow for selection of different types of carpet, tile, wood, etc. From the base price per square foot, you could calculate the total price via configuration of total square feet needed, type of padding/finish, color, adding on removal of old flooring, etc.