I've priced out a bunch of travel options for my cruise out of Galveston, September 2014. For 3+ travelers, cruise transfers aren't very affordable. Recently I've found that Costco offers a 25% discount on certain rental cars, and renting the car for 8 days, and paying the $65 parking fee (in advance) for the week is looking like the cheapest option so far at about $285. Some round trip taxi fare estimates come close to that, so it all depends on your preference. The only cheaper option I can find is splitting a 10 person shuttle with other cruisers, but trying to find others to split with is tricky.