I recently went to Zurich to visit my Dad.
He took me to the model shop in Glattbrug called Buch air :-).
it has a variety of models, for a reasonable price. Though when I went they did not have much on the 1:500 front ;-(......Though some of the rare/special models such as the CX, discontinued and club collection models are reasonably priced.
in one of the windows it has the herpa 1/500 old foils with an awesome layout, it is worth having a look.
If you ever want to visit the best way to get there is by getting the S-bahn to Opfikon and then its a 2-3 minute walk from this station stop.
If you are airport/air crew staff and you have a pass BRING IT, as you get 5% discount on all models, it doesn't matter which airport the pass has been issued at either :-).