Solar Power Kits
If you know a kid who loves tinkering and putting things together, you may want to consider purchasing a solar power kit. These kits come in different variations, but they are all similar in that they allow the child to build solar-powered toys using their own creativity, with an understanding of how solar power works. Although some of these kits are more expensive than most solar-powered cars and animals, running at about $70.00, you can find cheaper options as well. At the most expensive end, for $68, Thames and Cosmos Solar Power Plus is a "giant photovoltaic's science lab," where you can build 22 different solar powered toys while learning about basic concepts related to solar energy.
On the cheaper side of things for $24 on Amazon, you could try out American Science & Surplus's Solar-Powered Boat Kit. This kit supplies the solar panel, hobby motor, two different types of propellers, tape and tubing, as well as three different boat designs you can make. What do you supply? The soda bottles, of course! These models are built using recycled soda bottles as a frame for solar powered boats. You can also try OWI's 6-in-1 Educational Solar Kit, which enables you to build tiny models that demonstrate how solar power can operate different types of toys (e.g., a fan, an airplane, a mechanical puppy).
These solar powered toys are the perfect gift choice for a science-loving child who enjoys building "cool" toys.
All images from Amazon.com product listings.