Toddler/Booster seat?

[upstategirl]

We have a graco comfortsport carseat now but, Bruce is getting too big for it. His head is almost over the seat and the belt is getting very snug. I can't losen the belt anymore either. In winter it will be really tight. So, I need a new carseat. He's only going on two in Oct so I can't get a booster but, can get him a toddler/booster seat. Does anyone know of a good one but, cheap one.