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Amazon [amazon.com] has K’NEX Education: Levers & Pulleys Building Set for $ 13.91. Shipping is free w/ Amazon Prime or on orders $ 25+.[LIST][*]The set includes 130+ parts for a single child or team of 2 children to build 3 unique lever or pulley models: a balance, a wheelbarrow and a Sailboat.[*]Students will learn about lever classes, pulley systems, resistance, effort, mechanical advantage and more!