I just noticed, that this offer is also available through the "state of the yard" blue/red SBB ticket machines, just check the "day cards" option there.

For Zurich, i think there is no gemeindehous, and also I don't think kreisbuero provide such tickets. Have to buy it from
Stadtpavillon Urania
Werdmühleplatz
Zürich
Tel. 044 212 81 70

as it is not listed in the http://www.tageskarte-gemeinde.ch/

cheers
Ollie