There are not any current how to's or tutorials on this subject but I can give you an overview of how you could accomplish this.
You will need options in a table that have an item id column to relate to the items and the other values for you options like the price and name.
With this in place you can create a recordset that pulls from this table for the current item. You can use this recordset with a select list to display all the options for a product.
Next you would need to have a recordset that will select the option that the user selected based on the id of the option that was submitted. You can then use the price from this record as the price binding in your add to cart server behavior.
This is very broad overview for you to get an idea about how this can be accomplished. Post back with any questions that you have about any part of this and I will be glad to help with whatever I can.
