I know that the source is "Mina", however, I need it free of charge, I have already searched for several sites and nowhere is it available.

It's a commercial font. If you need to use it, you have to buy it.

I too need this type of font. How much can I pay for this font? Is it costly...

You can buy it here: https://www.myfonts.com/fonts/resistenza/mina/