SuperShuttle offers discounted rates: $14 One Way or $26 Round Trip.
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Upon arrival at airport, please get your luggage and follow signs to the SuperShuttle ticket counter located in Terminl B and C baggage claim area next to door 4 and 9 and check in by name or confirmation number. The agent will assist you in boarding the next available shuttle.
You do not have to have an advance reservation to ride SuperShuttle, but without a reservation you will pay the full fare at the ticket counter.
Here is complete information on the discounted shuttle service