It was $29.99 on Fry's.com and should be that price all week unless it sells out.
Best Buy is having a B2G1 free on 3DS Games.
Amazon had it for $29.99 for a day or so as a glitch a few months back.
It was available through Newegg for $29.99 after a promo code.
But as far as current prices I'd say BB or order it through Fry's are your best bets.