sting (one) for (something)
To force one to pay a large amount of money, especially when that sum is surprising or seems unfair. The mechanic stung me for nearly $800 for various repairs when all I wanted him to do was change the oil. I was stung for a huge tax bill because of the money I won last summer.
sting someone for something
Sl. to cheat someone of a particular amount; to make someone pay for something. That guy stung me for twenty bucks! Toby was stung for the lunch bill.
To charge someone some surprisingly large amount of money: The airline stung us for $100 to change our ticket.