Shopping with Penguins

I have concluded that those penguins must be taken shopping for swimming suits at once. Obviously, the human won't keep them in line in the stores, though, so I'm afraid I'll have to lag them myself and supervise them. Does anyone have any ideas about what fare the bus company will charge for a group of penguins? They're kind of small, but some of them are rather plump to say the least. I'm sure I can shove them all into the same seat, though, so wouldn't that make them only worth one human fare?