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Amazon [amazon.com] has 10-Piece Fisher-Price Wood Montessori Toy Triangle Puzzle for $2.86. Shipping is free w/ Prime or on $35+.

Product Description from Amazon:[list][*]​Montessori toy that introduces early geometry and shape manipulation through hands-on puzzle play to help foster critical thinking skills for preschool kids ages 3 years and older[*]Decorative dots help guide kids as they put the pieces together to build triangles in different ways