cost a pretty penny

стоить кучу денег
влететь в копеечку

Meaning: to cost of a lot of money, or at least into relation to how much money the person considering buying the service/good makes/has

Example: "I cannot believe my wife lost a piece of jewelry again! That last ring I bought her really cost a pretty penny."

Another one of the same meaning is 'cost an arm and a leg'.

— Vivi
In view of organ donorship you might also say 'It cost him a kidney and a lung' or any other pair body organ :)

also [cost a pretty sum]
also [cost a packet]