After you sign up, you can describe exactly what you are looking for, and receive offers on it from sellers. The site has a wide variety of merchandise, such as cars, jewelry and even real estate. You can describe what you want in general terms or be very specific. For example, to request a car, you can list make, model, mileage, color, and price range. Registering, posting requests and buying all are free.
Frequent sellers can get cheaper plans.