| Quote #1
You can go by foot. / You can go / by cow. (10-12)
These are the tamer choices offered to Marvin K. The Narrator is just getting warmed up.
| Quote #2
You can go / in a Crunk-Car / if you wish. (43-45)
This quote clearly suggests that Marvin K. can choose to leave however he wants. But is the whenever a possibility? Maybe we'll find out later in the story.
| Quote #3
Or stamp yourself / and go by mail. (49-50)
Certainly not the most recommended option, although perhaps one of the cheapest. They do say you can mail almost anything.