Need 400 Craigslist posts

Hello all. Please read the exact terms of this work before bidding. I need 400 total Craigslist ads. These ads will occur in the 200 largest cities of the U.S. 200 ads will be placed in the "wanted section" and the other 200 in the "selling section" I am willing to pay between $.50 to $.75 per ad. HOWEVER: The ad must stay up for the full 7 day duration. It cannot be flagged, ghosted or taken down. You must provide me with the link for each post, and I will check against the main page list to make sure the post has not been taken down or ghosted. Each post must direct the user to my website to use my service (buying used electronics). I will only pay for articles that stay up the entire time and are not flagged, ghosted, or taken down. All payment will be made upon completion of work. $0 up front. Please only bid if you abide by these exact terms.