Right now I am trying to find a shopping cart for my site that will sell crafts and am trying to find a shopping cart solution that will let the customer select the dimensions they would like and it calculate on the fly the final price.

For example they want it 4 feet tall, and 6 feet wide and the price per square foot is $1.00. I would like it to calculate it and send it to the cart for me.

Does anyone know of a solution?