We went the inexpensive route and hired school buses for wedding transportation. Not the classiest thing but it has a certain charm. It was cheap, easy, and the buses were clean and nice; however, the bus driver left each stop too early and didn't return so some guests were left stranded. On the other hand, they put up with a lot of drunk people who I'm sure were annoying at the end of the night and didn't complain a bit.
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