Craigslist Ad Posting - Weekly

I would like to pay someone to post ads on craigslist 3 times a week every week in all of the major cities covered on the website. You must be able to post using multiple IP addresses through proxy switching and they must be US based. We do not want our URL/name getting banned on Craigslist so these postings must be done correctly and carefully. We have used automated posters and they DO NOT WORK. Please quote me a per AD posting price.