Total Posts: 1372
Blue Mountains, Oz
Hi again Amy,
OK, I don’t think there is an ‘out of the box’ solution for your situation at the moment.
So, I would suggest you either come up with a flat rate for multiples of the product, and average out the costs to cover your expenses.
But if you want to pursue a more definitive solution, you could look at this product:
and then email Karen (author) and ask about adding the cubic weight functionality.
I’m guessing that it is possible, because she has that code in other extensions (and she’s very helpful and creative when it comes to her code!)
This is an issue that others are concerned about and Karen and I have been talking about adding it into an Aust. Post module for Magento.
Hope that helps.