If at all possible, personally I would bring my own. That said, I think most, if not all major car rental agencies will rent child seats, but you must be renting a vehicle from them also. I have heard the cost ranging anywhere from $4.00 - $10.00 per day, some also have a max. amount they will charge you if it is a longer rental. I would check with the agency you have in mind, either on their website or call them.