with the method digi prescribed, the buyer gets their own cost from the shipping calculator..

it uses their post code to work it out, so the postage quote that I see is different to what someone else will see, and the amount gets entered automatically into the invoice.

just be a little bit cautious though, cos I have read where sometimes the calculations are a bit different when you actually go to the PO to post it. but on the whole, I assume it's all pretty right because heaps of people seem to use it.