Does BestBuy automatically lower their price when they bill you if there is a price drop during the pre-order process?

I pre-ordered at $39.99 when it was first made available (which I thought was high to begin with) and when I looked today it was now $23.99... I ordered again and cancelled my original order just in case... I may risk not getting a copy now as there was "limited qty's" but I'll wait and see...