Altatac via Walmart offers the Discovery Kids 14-in-1 Solar Powered Robot Kit, model no. DK-SOL14-RBT, for $13.99 with free shipping. That's tied with our mention from a week ago and the lowest total price we could find today by $4. Kids can build one of 14 creations that can travel over land and water. No batteries are required, as it comes with a solar panel.