If you wish to file using the TurboTax Premier Online version, there will be an additional fee to prepare & file the Minnesota state return. TurboTax will prepare the return once you've finished entering all the federal information and you'll be charged the additional fee only if you want to file the state. At that point you can choose to file the federal return only.
If you wish to file using TurboTax Premier Desktop/Download version, then you'll be able to download the Minnesota state package at no additional cost, which will allow you to print & file the state return by mail. If you want to e-file the state return, there will be an additional fee for that.