A booster chair is good for a child till he is either 8 years old or 4ft and 9 inches tall, because since then the safety straps are used.. So your time and cost of investment will be 4 years and within a range between 50 to 200 dollars respectively. Another alternative option is leather chair, which costs around 300 dollars. Although it costs a little more but if you spread the cost over a period over 4 years, it is less than 8 bucks a month, you pay for coffee at your local shop in a week.
However, always prefer to choose a much shorter payback period, may be,of 30 days, because any time the child’s dislikeness may scrap all your judgment