This seems to happen every time I order something from a vendor (though not any that advertise here). The bottom line is that they do not want the overhead of keeping an inventory. Most of these are VERY small businesses. When someone places an order they simply turn around and place the order with the manufacturer. I agree that it's annoying as hell.
The only real alternative is paying higher prices with larger vendors who maintain an inventory. Like most things in life there is always a trade off.
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2010 S4 Current | 2010 BMW 135i Retired | 2006 Lotus Exige Retired