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Amazon has a few deals on K’nex sets
K’NEX Thrill Rides – Twisted Lizard Roller Coaster Building Set with Ride It! App – 402Piece – Ages 7-12 Building Set [amazon.com] – $ 15.69
K’NEX Thrill Rides – Panther Attack Roller Coaster Building Set with Ride It! App – 689 Piece – Ages 9+ Building Se [amazon.com]t – $ 20.14