If the seller had stated some kind of variable shipping, then no problem. I can work with that (although I think $13 is a bit extreme for 1 book, but whatever). But this person waited a week after auction closed and I paid before communicating some vague statement on shipping to CA, not asking at that time for more money, then 3 days after that finally asking for more money. Personally I think the book sold for less than he wanted for it and is trying make up for it at my expense. This is what is upsetting me and making me want to hammer him in his feedback.