Shepherd's whistle
They are also produced commercially. Simple whistles may cost less than 1 USD in bulk; expensive ones may be quite ornate. They are commonly made of plastic, aluminum, stainless steel, silver, brass, titanium, Corian, jade, buffalo horn and other materials.
Nickelodeon Universe
On March 12, 2008, the Star Tribune reported that the price of ride points, daily wristbands, and, in particular, annual passes, would take a significant price hike once the park transitioned to Nickelodeon Universe. The price for an annual pass, which had remained $99 per year since the park opened in 1992, would increase to $250, and daily wristbands would be raised from $24.95 to $29.95. They eventually rose to $32.99 in 2014. Then in 2017, prices rose to where they currently stand at $35.99 for a daily wristband. On April 2015, the price for the annual pass drops down to $139. Some decreed the price increases as being unjustifiably high when compared to other parks, such as much larger Walt Disney World at $249.95 and local park Valleyfair at $79.95–$99.95. Others defended the pricing as necessary to accommodate the millions of dollars of investment needed to rebrand the park as Nickelodeon Universe.