Convert Commerce Currency to already made prices

[Fierce God]

I want and need to help my commerce store out by implementing member and public request by having more than just Currency in USD

I know how to use the tool in the Commerce to have multiple Currencies, But.......

I have a full store already with prices that are all different, 

Does anyone know how, or can suggest how a cloud cliente can auto convert all the prices i already have to new currencies? 

Instead of me having to shut down the whole store and manually go through each price and add the new currency?