Practical tips for Vienna-travelers
Tickets for concerts can be purchased at evening-cassa. There is no so-called "dual pricing system", where foreigners pay higher prices than inlanders.
Booking agencies (german: Kartenbüro) charge higher, but sometimes have bargains or sold-out events. The best buy...
Tickets can also be purchased in hotels (some offer that service).
Sometimes tickets are offered by black-marketers near a concert-hall. These tickets are expensive and maybe it is a fake. So, better keep hands off.