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The Hasbro Martian Matter Mega Set is $9.99, about 70% off the retail price of $29.99, at Amazon. This fun set includes everything for kids ages 5-8 to make aliens, including a variety of mix and match molds, "lunar lava gel" and "meteor mud." Plus, it comes with an alien space ship and a dissection tool. Shipping is free for orders over $25 and there's no sales tax (except KS, KY, ND, NY, WA).