No.
Yeah, you can for 70 bucks I think
Well at GameStop or EBGames they have a discount. You can bring in your DS Lite and an old game, then they give you a discount off the DSi. They do not allow the original DS.
probably at e.b games or game on
You need a flashcart such as R4. and A Microsd card.
You can... but, you have to pay another couple dollars (50 or so more) for it. DS lite and DSi have WAY different price values
some places you can exchange them for like 70$ and still pay the 90$ for the dsi that's like at gamestops im not sure about other stores or full trades for one.
no you can't play dsi games in ds but you can play ds games in dsi.
That offer ended, sorry.
There are five DS's: -DS -DS lite -DSi -DSi XL -3DS
Yes Nintendo ds games work on DS, DS Lite and DSI. The DSI does not support gameboy advance games but the DS does.
FYI, if it is out for DS, it is out for DSI.