greyhound tickets: Is there a possible way to call and get tickets ahead of time while only paying with cash? Or do you need a credit card for that? Or can you just show up before the bus departs and be able to still get tickets?|||u can book it online using a credit card. Site is greyhound.com. U can also book in megabus which is agood alternate. I have booked greyhound tickets many times. also u can book from the bus terminal also. if u book online u have to keep a photo identitiy proof and the credit card using which u booked the ticket with u and collect the ticket anytime before ur travel or 1hr before ur actual travel.