My two and a half year old is pushing the weight limit on his current car seat and I think we're going to have to move him up to a booster seat soon as he's about 38 lbs (car seat limit is 40lbs) and his head goes above the top of his current car seat. I don't want to spend a fortune on a booster seat but feel like he's going to need something pretty secure.
I'm a little worried he's not mature enough to stay put with just the seat belt as opposed to the 5 point harness he's used to. From what I've read most kids don't go to a booster seat until they're 4ish years old, but he is the size of some four year olds.... Any suggestions for reasonably priced booster seats that would be good for him??