As a Buddhist I am taught to not believe in the existence of a soul. So if I sell my soul to the Devil I am in effect deceiving not only the Devil but myself as well. And not only am I deceiving myself about I having a soul but that there is even a devil to sell my soul to in the first place.
And I haven’t even come to the question of whether there is exist any meaningful value of things yet, let alone a price for my soul.