For the average rollercoaster, $15 million (US) and they are becoming more expensive.
I believe it was 30 million.
The tallest coaster in the world is kingda ka, and the price is mind-boggling: $25,000,000
$12,000,000 USD .coaster-net.com/ridegallery.php?action=display&id=78
Expedition Everest
The cost to build a Kinda Ka roller coaster at Six Flags Great Adventure is estimated to be around $25 million. The price can vary based on factors such as location, design, and materials used. Kinda Ka is known for being the tallest and second fastest roller coaster in the world, which contributes to its significant construction costs.
$23.58
5 cents and a bj
The Leap-the-Dips roller coaster, located in Lakemont Park, Pennsylvania, was built in 1902 and is recognized as the oldest operating wooden roller coaster in the world. The original cost of the coaster when it was constructed was approximately $5,000. Adjusted for inflation, that amount would be significantly higher today, reflecting the historical significance and craftsmanship of this classic ride.
$ 10
The Ride of Steel, a roller coaster located at Darien Lake Theme Park in New York, was built at a cost of approximately $10 million. Opened in 1999, it was designed by the roller coaster manufacturer Intamin and is known for its height and speed. The investment aimed to enhance the park's offerings and attract more visitors.
Your whole life savings... im sorry):
14,000,000 dollars