I am so sick and tired of trying to make the Paypal 'buy now' button code work properly. Here's my problem:

I set the price of a product, say £10 and I set the shipping (manually overrided for this product) to say £3.

When the buyer clicks 'buy now' they see their cart (it says 1 item at £10 and shipping at £3 = total of £13 to pay.

If they select more than one, however, say they buy five items the new total says:

5 items at £10 = £50
Shipping = £3
Total = £53.

It should say £65, (order total plus shipping total multiplied).

How do I make this work for a UK buy now button without typing in the prices margins in the shipping options page, because I have several products with differing shipping rates.

Thank you in advance!