Should I purchase it now online or wait until I reach the Interlaken train station on July 13 and purchase it at the train station?
Can you purchase it at the Interlaken train station the day that you're entering the region?
If so, Is the price the same if I buy now or the day of?
We'll be in the area July 13-17. At the moment the weather forecast doesn't look that stellar but you never know how reliable these mountain weather forecasts are..