K'NEX Dragon's Revenge Thrill Coaster $26.40 (regularly $55)

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Amazon has the K'NEX Dragon's Revenge Thrill Coaster on sale for $26.40 (regularly $54.99).

Think outside the blocks with this real working roller coaster that you build yourself from 578 parts, including classic-sized K'NEX rods and connectors. Once you've built the structure, attach the tower & drawbridge pieces and assemble the Dragon - his wings really flap when you turn on the battery-powered motor.