I think that in this case it is necessary to choose not the cheapest, but the quality one. This is for children. This should not harm your child. But I agree that there should be a good value for money. I can advise you a site where you will find the great deals
https://bestazy.com . It is cool service. They help to make the online shopping process easier. They find products, make a review, choose the best. Try searching there.