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.
The views and opinions expressed in this post are those of the author and do not necessarily reflect the official policy or position of Bimmerpost.
2014 CC R-Line DSG | 2010 S4 Sold | 2010 BMW 135i Retired | 2006 Lotus Exige Sold