It came out at Essen 2012. There are currently no U.S. distributors. I contacted Frank directly via their website e-mail address. Shipping and Paypal fees are more than the cost of the expansion. $11+ PayPal fees was the total cost when shipped to a U.S. location.
It's available via some European websites: Milan-spiele.de (6.40 EUR), spiel-offensive.de (5.99 EUR)