Hi Michael416
Thank you for your request.
The price is not the same every day. The saver day pass are available in different price bands with different advance booking periods and availabilities. If today you find an offer for CHF 29.00 for August 19, tomorrow it may be CHF 39.00 or CHF 49.00 (with half price card).
The earlier you buy, the cheaper you travel 😊
More information under: https://sbb-tickets.cc/en/travelcards-and-tickets/tickets-for-switzerland/1-day-travelpass/saver-day-pass.html
Best regards
NicolasK