Need Proxy Server

Need Proxy Server for postings ads on craigslist. I will need proxies ongoing. I must have some samples to try before buying. All proxies must be domestic, USA, and not all from the same area. They must be from various cities. Please amswer me the following questions through PM Where will you get the proxies/ IP Addresses ? How can I be sure that they are exclusively for me? How many days will the proxies work? What is your PRICE? PM me with your rate and sample. Happy Bidding