In my situation I am actually posting individual products (they are used items) so I need to post manually. One of the sites I use to post charges $499 a month to keep one ad live at all times in the top 100 cities. It might seem high but when you consider the cost to alternatives like google adwords or facebook ads it is much cheaper.
Take for example the package that one site sells is $499 for 100 ads live in the top 100 cities. If each one of those ads gets you just 5 visitors a day (and some of my ads will get 100 to 200 visitors per day) that is 500 visitors a day from those 100 ads or 15,000 visitors a month. It is good quality traffic because it is a visitor who saw a product for sale and then took the time to type in or copy and paste your url into their browser so clearly that is a visitor who is actually looking to buy that product. The niche market that I am in the average cost per click on google ads runs around $.68 a click. so if I had to pay $.68 from google for 15k visitors that would cost me $10,200 vs $499.
The same goes for Facebook ads. I was paying an average of $.23 a click from Facebook for some ads so to get those 15k visitors I would spend $3450 from facebook vs $499. So it might seem high but for that high of a quality type visitor it is actually dirt cheap. You also have to consider your time. The SEO side is great because it is free visitors but how much time do you spend on SEO work to get and then maintain those rankings. If you really consider the labor and cost with SEO to get ranked for competitive keywords vs the rate of return it is even a better value than SEO.
