What is the reason for this price difference?
1Password Version: 5.4.2
Extension Version: Not Provided
OS Version: iOS 8.3
Sync Type: Not Provided
I apologize for the trouble. It appears you attempted to purchase in the middle of a sale ending. Sometimes the app store gets a little wonky when prices are in the process of being changed. The 9.99 is the correct price.
If you try again that should now be reflected everywhere.