Considering the fact that GameStop only gives you a fraction of the price of a product when you sell it back, you would most likely receive around 100 dollars (99.99) for trading in a Nintendo DSi system.
$50.00
You can trade in a DSi for money off a 3DS yes. Be warned that the trade in price for a DSi is at rock bottom pretty much.
it cost about 99.99
200 bucks
Ds light is $50, Dsi is $70 and Dsi Xl is $100
It doesn't cost anything if you trade your older version for it.
$80.00
About £110 Hope I helped
At Gamestop if you trade your DSi for a DSi XL you get $80 off the DSi purchase($189.99). If you trade your DS Lite for a DSi XL
I don't think a TV. is worth as much as a flea market AND a DSI
A new DSi costs around $150. If you trade in your Nintendo DS, you will receive about $70 back, which means you will need $80 more to purchase a DSi.
You can Trade a DSI in at Gamestop, they will give you credits for your DSI to buy something else, such as a 3DS.