I got Feel the Magic for $20 within the first month of its release.
That said, I haven't seen any deals for DS games at launch like you tend to see on GBA games. Usually, BB or CC has a launch day sale to save $5 or so, but not recently. I woulda bought both Pac-Pix and Polarium had they been on sale. I would have jumped at Polarium if it was a budget title here like it is in Japan.