Should I sell my Nintendo DSi XL?

A couple months ago I bought a Nintendo DSi XL thinking it was going to be so much fun. But I quickly lost all interest and went back to Habbo Hotel and Runescape. I have the Burgundy one with 1 Stylus, a broken charger that I'm guessing they wont take, and Pokemon Soul Silver. I'm guessing they'd give me $120 store credit, $65-80 cash. But I have almost NO knoweldge on this stuff and being only about 3 mo old and not touched that often, I'm sure theyre not gunna lower the price that much, but than again theyre gunna undercut me at every flaw so yea. Is it worth selling and putting towards the 2 games that I DO play? If so, I'm sure most of the people answering this will have a better knowledge of the prices too, so if you can estimate how much I would get that would help. Because I dont want to call in unless I'm sure I want to sell it.