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.