Amazon also has it. Link

Cheaper on Amazon CMON Zombicide: Wulfsburg Board Game https://www.amazon.com/dp/B01A4MPOW2/ref=cm_sw_r_cp_apa_622DBbJ801K00

It was already back in stock for a few weeks now. I didn't buy it since I heard it may work well with Green Horde. I have Green Horde and pre-order the other 2 GH expansions