There are merchant affiliated sites that will allow you to promote your Internet advertisements on their site for a small fee. However, you must realize most of these merchant web sites are very large and the response for your individual Internet advertisement might receive the results you may want to achieve.
These merchant affiliated web sites advertise for large companies and individual contractors as well. You might want to consider a different source if you feel your Internet advertisement has much of the same content as those that are already listed on the merchant affiliated web sites. However, if your Internet advertisement if of unique content you might have a very good chance at promoting it on a merchant affiliated web site as to any other way on the Internet.
Basically, the concept is always up to the individual and the content of the Internet advertisement as to where you actually want the Internet advertisement to be. With the merchant affiliates web sites the cost is much lower, however as said before, there are many that are advertising on the site, and many of them get great results, if their content was actually placed on the web site...