Hi Dave Davies,
There is no built-in module or control that can calculate the quantity of products. Generally you can use one of the built in modules as a backend. You can create a metakey which will be the price of each product. You will need another metakey that will be used to persist this value if you want to save it. For your public control you needs product
buttons which changes the quantity, literal
that shows the quantity and another label that shows the quantity per item and calculates the price of the items using basic ASP.NET.
Then another lable willl show the total proce - just simple calculation of all products that have been selected. Also when you click on add/remove
buttons you can use jQuery - html attribute to change the text values or make a post back - here you can use UpdatePanel and coockie or session to persist the data after post back.
You mayfind the following example useful - Grid / RadNumericTextBox for Footer Totals
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