Pay through the nose!
Boris: I've had to pay through the nose to get my 3 children through university.
Tanya: University is very expensive these days. I'm glad I don't have any children!
Pay through the nose - this English idiom means to pay a lot of money for something.
My parents payed through the nose to nurture us. ^^
Another way is to say "It cost the earth" meaning it was very expensive, costing a lot of money.
That's another good one. Thanks. :)