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Tenergy via Amazon [amazon.com] has Tenergy Odev Geo STEM DIY Building Toy 2-in-1 Salt Water or Solar Powered Robot Car Kit – $ 12.99
Coupon code: WE78PBIF
Key Features:
– Learn as They play: Geo Robot is powered by renewable energy (salt water, metal plates, charcoal, or direct sunlight), using a safer and non toxic power source.
– Easy-to-build STEM Kit: No screws or tools are needed