craigslist updating on keyword searches throughout US

I used to use craiglook and now it has been taken down by craigslist. I understand that they used rss feeds to gather information that they put on their website. I have 50 different searches that I need instant rss feed if something comes up for sale based on those 50 searches in all US cities. -A must knowledge of RSS aggregation -A must knowledge of Mashups I need this for my own personal use. The information can come as a email. You can look at our website www(dot)originalartbroker(dot)com to see the artist that we sell and they would be the artist names we would use for the search. Will only open responses with "craigslist master" in heading. Please share your ideas on how you are going to make this work for me. I would like it to be expandable if possible or a bid for whenever I ad a new artist we will search for. thank you