For Prime members only, Amazon offers the Diono Radian RXT Convertible Car Seat
in Shadow (pictured), model no. 16930, Storm, model no. 16940, or Plum, model no. 16910, for $249.99. In-cart, it drops to $199.99
. With free shipping
, that's the lowest total price we could find by $50, although we saw it for $204 with a $40 store credit in December. It features a 5-point harness, memory foam padding, adjustable head support, 45-lb. weight capacity when used as a rear-facing car seat, 80-lb. weight capacity when used as a forward-facing car seat, and 120-lb. weight capacity when used as a booster seat.