RX Bar Kids Peanut Butter Jelly Bars If your kids are all about PB&J sandwiches, chances are they'll dig right in to these RX Bar Kids Peanut Butter Jelly Bars ($10 for five bars). They are smaller than regular RX Bars and the core ingredients are listed right there on the front of the package. Image Source: Amazon RX Bar Kids Peanut Butter Jelly Bars $10 from amazon.com Buy Now