Is there a charge when you are not a Mexican citizen !? And how much is it?

And if I only go with the passport and flight and do the visa procedures, can I? But with migration from the United States?

If there is a charge for the Mexican immigration permit, it is the FMM form ..... if you are a foreigner and you go to Mexico for more than 7 days, if there is a charge for the permit .... but only if you go for 7 days or more. .... if you go less still you will have to fill out the FMM form ..... but they do not charge you for the permit

No charge