I've just uploaded a package to the Unity Asset store, which allows you to easily source and cache data, in a secure manner, from a Google Spreadsheet!.
It is called
GlobalData, and allows you to have truly global data across your game instances. You could use it to provide item stats, character stats or any kind of tabular data to your game, and you can even modify your core data after the game has been released.
It caches data locally, so your players won't require a constant internet connection to play.