Only what you will produce yourself will be really "free". Even then, it will have some "costs" of other materials that you didn't/couldn't produce yourself.

But even let's say you can make all the materials / ingredients of a product by yourself, you still have to use some... ENERGY.

And right there... we are going back to Bitcoin. because Bitcoin is energy stored in a brilliant way.

I would say that what you are "paying" today to get some BTC it is the price for your future "free" product, if you can consider it like that.