Is there a website that tells you how much money you will get if you trade in certain games?

For example, I want to sell my PS2 games.



I want to know how much money I will get. Like a Trade In Calculator.



Please don't say "I don't know of one". If you don't, please research. If you have some selling tips, go ahead.Is there a website that tells you how much money you will get if you trade in certain games?
Really no store/site will actually buy your game, you get certain credits for that store in particular.

Also the game you trade in will probably be 40% of the original cost of how much you bought it for....or how new/old it is.

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