noun
mate's rate; friendship price
A discounted or preferential price offered to a friend, often in informal transactions.
これは友人価格だから、他の人には内緒だよ。
This is a mate's rate, so keep it a secret from others.
彼から中古のカメラを友人価格で買った。
I bought a used camera from him at a friendship price.
Compound of 友人 (friend) and 価格 (price). A straightforward modern coinage.