Online auction and classified websites are all available for a person to place an add for their ErCoupe Airplane. Most user-generated e-commerce sites allow their users to sell their goods to other users. Other mediums can also include online networking sites.
Online auctions, such as eBay, allow a user to post their item for a world wide consumer market. eBay charges users a fee to post their item as well as a final item fee if the item sells.
Online classified sites generally offer free newspaper reminiscent listings that categorize their product into one of many categories. Classifieds are generally targeted towards local sales.
Online social sites allow an enthusiast to narrow their market down to other like minds. Although the market is more narrow than the other mentioned options, listing the item is generally free to do.