craigslist e-mail address extractor

I need a program to do the following: 1)Search all Cities in the US (350+) in a Category such as jobs for a specific word (which must be changeable) such as Office 2)Record the results in an excel spreadsheet or .txt file with the e-mail address, date of ad, and the city of origin. 3)This project must run for a trail period of three days without problems from Craigslist. If it runs for 30 days without a problem there will be a bonus of $50.00