We'll be taking the Student Agency bus from Prague to Cesky Krumlov and back to Prague in mid-July. I know which buses I want to take and their cost, and I can see there are still plenty of seats available. I could order two tickets online now from the U.S. but haven't found info in English that explains how I would obtain the tickets if I buy them online. I could wait until we arrive in Prague in July, four days ahead of the bus trip, and buy them in person but there is the chance that two seats would not be available (or available together) on the buses we want. Any thoughts about whether I should buy now or wait until we get to Prague? If I buy them now, how do I get ahold of them?