We'd be hard-pressed to present a better deal on a DS game than the newly price-dropped Phoenix Wright Ace Attorney: Trials and Tribulations. Except for, you know, those deals on the previous games. But those don't really supercede this deal, because you really need the whole series. Seriously, if you can read (which you can, we are absolutely certain), you should pick up Capcom's hilarious series of visual-novel style adventure games.
The new $20 price point for Trials and Tribulations seems to be a universal price drop, reflected at Best Buy and GameStop so far. Amazon even has the game for an ultra-low $19.79, saving you twenty crucial cents.