I think this is a pretty common practice these days. Especially for places that have a big selection, they can cut costs significantly by not stocking and drop shipping most items.
The ones that irk me are the NY camera outlets that take the order, charge your card the wait awhile and tell you the oversold the item so they are willing to sell you something not as good for the same or more money. They get real pissy when you ask for a refund.
