Got a really great rate for a rental through ez rent a car, but they charge $7 per car seat per day! We have 3 young kids, although for the oldest we could probably just bring his booster seat. I don't want to have to bring the other two car seats though because it seems like such a pain. We will be taking amtrak and can check the car seats in as luggage if desired. What should we do? I've also read some people complaining that the rental car co car seats are usually filthy. Anyone else experience that?