$17 free shipping w/ Prime点我购买
Amazon offers its Prime members the Hexbug Vex Robotic Arm, model no. 406-4202, for $16.90 with free shipping. (Non-members can spend $49 or more to qualify for free shipping; otherwise, shipping costs $5.48.) That's the lowest total price we could find by $4. Features include an articulated grabber hand, 360° rotation, and over 350 snap-together pieces (no tools required).
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