DS2 is 5.5 years old and his harnessed seat is expiring soon (used from birth until now). He is a tall, sturdy kid - over 4' tall and 50 lbs. I assume we'll get him a high backed booster. He is in a backless booster for occasional travel in DH's car and does fine with sitting nicely in it.

What are the current recommendations for a reasonable seat (not fancy and expensive and also not super cheap)? Not worried about width, this is for my minivan, and he is my last DC in a car seat. Any sales going on now or in the near future?