The towncar services are running about $40 r/t. We used the Lynx bus system in August. You can catch it at TTC. It's $1.25 pp each way. Have exact change. Tell the driver you want to go to SeaWorld and he'll stop at the parking lot for you. You catch the return bus right across the street from the parking lot. You can get a bus schedule either on-line or at the TTC itself.
I recommend MEARS. We scheduled in advance and they were on time.
I also recommend the "Swim with Killer Whales" program!!!! You have to book pretty far in advance, I think they only let about 12 people per week swim with them, but it was sooooo cool.
Mears was affordable and on time both going and coming back from SeaWorld as well as Universal...
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