For new products/services to track, repeat steps 1, 4 and 5.
1. open www.craigslist.com
2. set up your search criteria
3. When you finalized with search criteria, click the button "ADD TO TACKING LIST"
You can set to fetch the server from each 5 minutes to the time you desire. Please set your preferences for each site from the list. By default it will be 60 minutes.