I just got back from the 3DS launch at my local Wal-Mart and the offer is correct, BUT there is a small catch which the author left out. In order to receive the full $200 store credit the DS must be in good working condition with minimal scratches on the screen, no cracks in the hinges, and have its AC adapter included. Even with those conditions met the trade in value goes like this:
~$20 for DSphat
~$50 for DSlite
~$70 for DSI
~$100 for DSI XL
I am as shocked as you! On a normal day in Washington, it seems like time and tax dollars are squandered on political pissing contests.