We have a Winnie The Pooh "the First Years" brand & its fantastic. We got it from Aldi but I think Kmart, Target or Big W have that brand
It straps onto a normal chair but a few times when we have been away at the van & there are only 2 chairs, we have found its sturdy enough to sit straight on the floor without DD being able to tip it. Occassionally we sit it up against a wall or something if she's mucking around