How much will GameStop give me?

I'm at my last resort so don't say don't do it
I don't have a choice anymore. I have a dsi (black with stylus and chrager) new super Mario bros, Pokemon black version, super scriblenauts, pokemon conquest, dragon quest VI, phantasy star 0, Devil May Cry 3, monster hunter tri (unopened with controller) for wii, resistance Retribution psp, white knight chronicles ps3, alternative species ps3, fallout 3 ps3, final fantasy 13 (no case), SOCOM psp no case, brain age ds no case, I have a lot more 75 in all but these are highlights I guess I'm also selling my psp 1000 and getting a used 2000 how much? All
In great condition.

Why are you asking this forum? Ask Gamestop.

Not as much as you would like but yeah, how can we read minds? We don't know what you have, where you live, what condition the stuff is in...... Don't be surprised when they give you back the stuff without a case