I don't have a complete knowledge of every business school, but if you want to go for the universities in town, you might consider the faculty of Economics at
UZH or the Business & Technology Faculty at
ETH. They both offer masters which are not extremely expensive, in English and with quite a high reputation: however, they might deviate a bit from the standard Business School approach (which might not be so much of a bad thing, especially in times like these).
There are several other Business-only universities in Switzerland which also have quite a high ranking such as St Gallen, HEC Lausanne, Geneva etc...you might want to look into them as well. Consider that most of them have entry tests which can be pretty tricky, so get informed in advance and come prepared. Good luck!