It's $18 per person rountrip from Disney Resort to Seaworld,Aquatica, Discovery Cove, Universal Studios.
When we were walking out of seaworld in June, there was a Mears van sitting in the lot by the bus stop we were told to wait at. We walked up to it, and he said he'd take us back to Disney-it wasn't even our time yet!! We just handed him teh return ticket and off we went!