I won an auction this morning and the item description showed a shipping fee of $2.00. Well, I did the Ebay checkout that takes you straight to Paypal and lo and behold, the shipping field on the Paypal invoice automagically filled in $7.00. Not a bad boost for a $5.75 item.
I cancelled out of Paypal and went back in directly without doing an Ebay checkout. I was then able to enter the described shipping fee and finish the transaction.