Meritline.com offers this 6-in-1 Educational Solar Robot Kit, model no. MSK610. for $5.99. With free shipping, that's $9 under our April mention and the lowest total price we could find by $6. It features one solar module, one gear box, and 21 snap-together plastic parts that can form a windmill, airplane, revolving airplane, airboat, car, or solar puppy. Assembled units measure about 4" across.
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