Play Asia is taking preorders for the game at $48.90, which is their normal asking price for a Japanese DS game. That's not too bad for a camera, a stand, and (ahem) miscellaneous bonus content. We hope it's within range for a few homebrew developers, at least.
Of course, its regular-priced-ness in Japan means that if, by some clerical error, Adults' DS Face Training somehow came out in the US, it would be regular US price of $30-$35. Don't hold your breath on that one-- although it may be good for your face to puff out your cheeks like you're pretending to hold your breath.