Trading in DS original

Alright i have a regular ds and nine games.

I want to trade them in to gamestop for store credit, so I was wondering how much credit I could get?

You will not get that much. Gamestop tends to pay people low amounts of money for their stuff and then they sell it at a way higher price. I would look into ebay or craigslist.

i was considering craigslist but i heard you can get $70 for a old DSnickerbocker99