발품in English:the effort or trouble taken to find or buy something

Examples
with 발품.

• 좋은 가격에 물건을 사기 위해 발품을 팔아야 했다.joheun gagee mulgeon-eul sagi wihae balpum-eul pal-aya haetda.I had to put in a lot of effort to find a good price for the item.