Depending on the model of car in question, used parts are often cheaper than brand new versions of the same, and are sold for much less in some places than others. Automotive stores may sell used parts at a market price, while others use more open and negotiable pricing methods.
According to articles and information, such as listed pricing and tips, used automobile parts are generally cheaper than new parts. New parts from a dealer or a car company are always much more expensive than the used alternatives, much like with most used products. Junkyards are a good place to locate used parts for those who don't mind going to the extra effort of finding them.
There are hazards in the utilization of used parts. Used versions are not a great choice for those automotive parts that are going to wear down quickly, so new parts are the better choice in this case. Parts that do not see much wear and tear are more economical to buy used, particularly parts that do not involve the more strenuous parts of the engine or just last longer compared to other parts. For example, tail lights and steering wheels are better bought used rather than new.