Craigslist Project - 10 posts per day

I wish to trade some real estate for a specific car. The Craigslist postings will be very similar and must be posted in the same section in 10 specific cities every day until I make a deal. The area of the posting will be "for sale / wanted" > "cars & trucks - by owner" I will only pay for listings that remain live for a minimum of 12 hours. YOU must find a way to prove to me that the postings were still valid within 12 hours after original posting (I'm not sure how to do this but I'm sure it is possible). Or you will not get paid for the listing. ONLY bid if you are fully aware of Craiglist posting regulations and can perform this task using manual (not automated) methods The budget for this project is $30. Please tell me how many postings you bid for $30.