I don't know if this is the right place to ask this, but google said it was

So here is my question.
I'm planning to sell my pld gameboy with some games.
One of the games is trip world. I think you know it if you check this URL http://www.racketboy.com/retro/nintendo/gameboy/the-rarest-and-most-valuable-gameboy-gbc-games

But as a rookie it is hard to put a price on it. What will be a fair price?


Greetings from Europe!