Check out this K’NEX 521 Piece Building Set on sale for $26.89 (Retail $32.27).
Build anything you can imagine with the 521 Super Value Tub! Loaded with 521 parts for lots of open building fun! Includes instructions/ideas for 35 unique models including dragsters, Ferris wheels, dinosaurs, creatures and more! Parts and built models can be stored in the convenient storage tub.
Shipping is free.