Hello Choongoofoogh40
Thank you for your message.
You can buy the tickets now but you can also wait until July. (Please note that international prices may change or increase)
If you already have a Swiss Half Fare Card that is not yet valid or if you are planning to buy one, you can order the tickets now with a discount.
The important thing is that you have a valid ticket or travelcard at the time of travel and if a discount is selected, you must present your discount at the time of travel.
I wish you a lovely Sunday.
Greetings TatianaR