Read through Gamestop's FAQ and they actually don't take money when you place your order. Must be a recent change as everyone on the net says otherwise. It does say so in black & white on their site though..
If you are pre ordering a product on our website and you want to guarantee you have it on release date select express shipping. With standard shipping we are unable to guarantee you will have your order on release date.
Important: Please note that for pre-orders purchased via MasterCard, VISA or PayPal we now take payment at time of shipping so please ensure you have funds available in advance of the release of the game.
So I've gone ahead and ordered the bundle. I'm sure they can still alter the price if they decide it was a mistake but I find that unlikely. If Destiny sucks I'll be cancelling.