Get this highly rated Graco 4Ever 4-in-1 Convertible Car Seat for $199.99 shipped (Retail $269.99).
This 4-in-1 car seat transitions from a rear-facing infant car seat, to a forward-facing 5-point harness seat, to a high-back belt-positioning booster, to a backless belt-positioning booster for kiddos all the way up to 120 pounds so it will likely be the only seat your kiddo will ever need!
Shipping is free.