I checked with camelcamelcamel and the
Britax Marathon is considered a good deal right now because the price is low. I have to admit it is a bit painful to spend that much on a car seat but I do feel good about how safe my daughter will be in the car.
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Re: PSA: Britax Marathon on sale
Yes they all pass the same MINIMUM requirements. But some far exceed those standards and are much safer. Plastic vs Steel. There is a difference.