The "Cow Parade: the Lighter Side of Zurich" is available in both English and
German. I bought the book in the Zurich train station (of all places!), but
it was available all over town.
I wonder if you'd have better luck checking the European Barnes and Noble or
Amazon sites or maybe even the Zurich City homepage? I have had good luck in
finding hard-to-locate and used books through Bibliofind.com.
Good luck! The book is a treasure.