MacRumors.com

BoyGeniusReport claims that the initial batch of iPhone 3G S shipments have already been allocated to pre orders, so if you haven't ordered yet, you will have to wait.

To make a long story short, if you did not pre-order an iPhone 3G S from AT&T yet, (we’re not talking about Apple because we don’t have information on their pre-ordering/stock levels, etc) your iPhone 3G S won’t be shipping to you/your store until “7-14 days” after the order date. It seems that all AT&T’s pre-order stock is depleted leaving only iPhone 3G Ss for dying-in-line purchasing on this coming Friday, and all pre-orders going forward won’t be fulfilled until after the June 19th launch date.

There is a chance that Apple stores will have a larger supply of the iPhone 3G S on launch, as they did with the iPhone 3G during its launch.