Does anyone know if there is any other place that you can rent car seats from other than the car rental agencies? We reserved our cars through Hotwire and Avis, and they won't add or guarantee us any when we get there. We have 2-3 yr. olds and 1-4 yr. old and would really like to not have to carry them with us if possible. Last year I remember that there was a place called Caribbean Granny or something like that, but can't find it now, and don't have the number. Please help. We arrive on St. Thomas on the 17th. Thank you.