I have a customer that wants to use zen cart but has a strange shipping arrangement. Each item may have a different shipping cost. I figured that I could use the per unit module and set the shipping cost in the weight field, but here's the catch:

If someone order 2 or more items, she wants the highest shipping amount + $2.50 for each additional item.

For example, if someone orders 2 items - the first costing $8.50 to ship and the second costing $5.50 to ship, she wants me to take the $8.50 + $2.50 for the additional item.

I wish I could combine the per unit and per item methods. :)

Is there a way to do this in zen cart?

If not, can you point me to the place where I could change the code? I am a php programmer, but I figured you could point me to the correct file to change quicker than I could find it. :)

Thanks,

Cindy