Walmart offers the LEGO Creator Propeller Plane, model no. 31047, for $15.99. (Toys"R"Us offers it for the same price via pickup, and Amazon offers it for the same price with free shipping for Prime members.) Opt for in-store pickup to avoid the $4.97 shipping charge. That's the lowest price we could find by $4. This three-in-one set converts from a propeller plane to a hydroplane to a helicopter.