This 6-Pack of Bath Bombs with Toy Rubber Ducks, originally $19.99, drops to $9.99 at Joyin Direct via Amazon. Shipping is free for Amazon Prime members or when you spend more than $35. Otherwise, it starts at $6.99. Other stores sell similar bath bomb sets for $20 or more. Each uniquely scented bath bomb is made with shea butter and coconut oil. These bath bombs earned an average of 4.6 out of 5 stars from 2,500 reviewers.