My son is ready for a high back booster in my parent's van. He's currently using a Safety1st Go Hybrid but the seats in the van are too short for the headrest to go up any further. He's 6.5 and about average height, but most of his height is in his legs so I'd really love something with an adjustable back and latch, but since it's for my parent's car and we only visit once every 6 weeks at most, I'd really love for it to be CHEAP. Does this exist?