We just got a 2nd car today (yay!). So we need to get a second car seat for my husband's new Toyota 4 runner. It doesn't have to be fancy at all, just an extra seat to use when she rides in his car, which is not very often. We will also be using it on a plane for a vacation this summer, so it needs to be light and easy to install in the airplane seat. My DD is 2 and we just flipped her forward facing. At her 2 year appt, she was 31lbs and 34 inches tall.

Recommendations? Preferably under $100 and able to buy today at target (or Walmart if I have to. ) Thanks!