https://www.swissrailways.com/en
On this site it says I can purchase using US Dollars, CHF or Euros. It is less expensive if I choose CHF, but then they want to charge me a 3% fee! It isn't a credit card fee, it is a fee to use their currency instead of mine. That seems strange. Is there a site I am not finding where I can purchase a STP in CHF's without paying the fee? The current exchange rate is going down a little and I wanted to take advantage. How long before I need to use it should I buy it? Our first travel day in Switzerland is September 20.
Thanks,
Janet