I bought a ticket here when I was standing at the bus stop. Everything is fine, the service is polite. If this is important to someone, I recommend buying coupons here. You can also buy a postcard for money at an affordable price.
Travel coupons, travel cards. Friendly sellers will help with advice, they can even change money if asked. Very convenient! But you need to be polite, understand that people are not to blame for your problems, and you just don't need to take out your anger on these people.