Is there any fee to extend Business (M) Visa for another 30 days?

Hello Mattmod! Generally speaking, you need to submit your passport, Registration Form of Temporary Residence, completely filled APPLICATION FORM with recent half-length, white background, bareheaded, full-faced 2-inch color photo, legal registration certificate of the inviting entities or individuals within China, and an official letter with official seal of the Unit issued by the inviting units to Exit-entry Administration Department. The detailed regulations for entry permit extension differ in different provinces and cities. So please tell me which province you are in now and I can give you more exact information.