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Have you thought about taking the train down? I have a Marine Mom friend that lives in Maine. She took the train down, it was the cheapest option for her.
I recently traveled to PI and didn't have any luck finding a shuttle. You could try calling the Savannah USO. If anybody knows, they would. I just ended up renting a car since it's hard to get around at Parris Island/Beaufort without one. It looks like there is a Greyhound bus that runs from Savannah to Beaufort a couple of times a day, but the bus station isn't very close to the airport. When my husband travelled, he ended up taking a taxi. That wasn't cheap. Maybe you could connect with someone here and catch a ride.
This is from a 2013 discussion
Hi Jean, You can get on the Savannah Airport website and search for ground transportation. I believe there are a few options.
I rented a car. Your recruit will have a lot of luggage to take back home so if you are renting a car make sure that you have room for 2 sea bags (big duffles) and a garment bag along with the rest of your luggage.
Hope that helps,
Susan (1~Momma Hen)
A friend just suggested uber.