How do you sell leg?

Put up a sign in front of your house saying, "purveyor of body parts, legs on special offer". Once you have done this, wait patiently for your customers to arrive. If they have guns and tazers, do not be worried, they are merely competitive buyers. If they then proceed to put you in handcuffs and take you away in their car, remain calm, as it is to take you to a special party which is for leg purveyors only, and involves wearing orange jumpsuits and anal rape. You should thank them for this opportunity by headbutting them. Don't mention it.