I'm selling identical items and for the basic small ones, I want the postage to be something simple such as $2 for the first one, and 20c per extra one. The problem is, I can't get anywhere to change the cost per additional item and its becoming incredibly frustrating for me.

I used to sell about 10 years ago, and back then it was so easy to set the cost per extra item. I've tried the flat rate postage discounts, but even that hasn't changed anything for buyers, and I can't really use flat rate discounts across all items when the postage costs vary.

What makes it more frustrating is that most buyers completely ignore the message of "don't pay until an invoice is sent" and pay the huge postage amount which I'm refunding yet still copping the 10% ebay fee on the difference.

Is there a simple way to select the postage for each additional item on each listing?