Delhi to Agra Bus Package?

[Sushubh]

a friend is scheduled to visit Delhi next month from abroad. they are looking for a single day tour to Agra. preferably including sightseeing and travel. something that can take them from Delhi to Agra show them around and bring them back on the same day. anyone has any ideas what is a good place to look for such a package? they were initially planning to book train tickets. i assume taking a bus is going to be better. convenient and fast.