My soul wouldn’t fetch a dime, I don’t think. And anyone who thinks their soul would fetch more, is deluded. Even if souls existed, they can’t possibly be of any use to anyone but the person they belong to. Even if Satan existed, he is utterly deluded if he thinks souls are of any value to him.
Soul is a metaphor for the magic that is a person that can only exist in a live body. However, it can only exist in the body that holds all those experiences and thoughts that created that person. The soul is worthless to anyone else, because it can not exist anywhere else then where it is.
You might as well ask what the price of a human is. Human lives can be taken cheaply by those who value them little. But a person can never sell themselves for any price in the universe. There is no market for souls.