I don't know if it's available at the states yet, but there is an online shop in Germany where you could order a group buy - they even have an english homepage version
look hereenter "Porsche 914/6" at the "Quick Find" on the left, it's the last in the list - for only $ 32.86 (you can choose the currency on the right side)
at the right side you can check out shipping costs to every Country
I bought several times at this shop, no problems so far