Be the master of your own destiny. We all hold the power within ourselves to achieve what we truly desire. Why shortcut things when the journey is the most important part of your destination? Seek who you really are, and when you find yourself, you will probably realize that what you are wanting to trade your soul for isn't what you truly want or need anyway.
There are entities that are powerful enough to bind your soul to them. Your soul does not cease to exist, but remains bound which is much worse. They feed off the energy of your soul, which is why they would take the time to give us a second thought. It can be done, but it is foolish.