All shop items are displayed as $0.99
Whether or not the game device is connected to the Internet connection, it is supposed to display the original price. However, on some rare occasions, in the process of fetching the prices from the app store, it may display $ 0.99 due to error caused by the app store.
In the case the wrong prices are displayed, closing the game and running the game again will resolve the issue as well as the player being charged at normal price upon purchase.