I am not sure how great the deals are, but I did get an email today from Amazon about their May Car Seat Event. My email says,
"Shop now through May 31 and enjoy savings on top car seat brands such as Britax, Safety 1st, and Sunshine Kids sold by Amazon.com."
I think there is a 20% discount at check out...here are the instructions:
Re: PSA: Amazon Carseat Sale