This sounds great, but the dropdown on the linked page and the table below it don't seem to match up.
One says Class A and Class B, the other says Group A and Group B, and the pricing for Class B 1 item is $40, whereas in the table Group B's 1 item charge is $20.
I'm assuming "ITEM:1" means Items: 1, and "ITEM:2" means Items:2, etc.?
And what do you mean that the costs are an indicative cost, with extra items billed back to the customer?