CraigsList Auto Poster

We need to post Craigslist ads in one catagory "Tickets" At this point we have to go to each city for each ad and post by hand, we would like a way to post ads in the "Ticket for Sale" to whatever city we would like. A desktop app would be expected that we can choose what to post with some random generated text, Ads will only be posted in the city we want not all cities, so we need a way to choose this in the app.