How much credit would i get for these games?

ok soo i really dont want three of my wii games. they are wii fit, just dance, and boogie superstar. wii fit (just game) nd just dance are in really good condition but boogie supertsar is used becuase i bought it for 17 dollars. soo i was just wondering about how much credit would i get altogether??plzz answer. ****for gamestop stores only***** :)