Walmart offers the Graco My Ride 65 Convertible Car Seat in Go Green or Sylvia for $77.77 with free shipping. That's the lowest total price we could find by $6, although we saw it for $6 less in April. This seat has a capacity of up to 40 lbs. in a rear-facing position and up to 65 lbs. in a front-facing position. It features a removable infant insert, dual cup holders, and a machine-washable cushion.
Update: It is now available in Sully for $73.17.