I don't think renting a coffin is a very good idea. In order to comply with applicable nondiscrimination laws, you'd have to rent to a zombie if he were interested. Yuck! Rent a coffin to a zombie for one month and you might as well toss it in the nearest dumpster!

You see, zombies have a tendency to lose parts of themselves without realizing it. After all, they're dead, so they don't feel it when something falls off. After a zombie had rented a coffin for a month, it'd have all sorts of disgusting zombie parts in it! And I won't even mention necrotic bodily fluids! I repeat, "Yuck!"

Do you have any idea how much it would cost to have a coffin cleaned after a zombie moved out? Way more than the coffin itself is worth!