Article download script

Hi I would like to extract articles from nominated categories from different article websites. I need a program where i can enter the name of the website and category and then it will extract all the articles from that category and save them as text file, or prefferably, as an XML file. I will use several different article directory websites for this. Please let me know your price and time frame along with a proposed solution. This may run locally on a windows PC, or prefferably as a script (using a simple html interface) run from a (linux)webserver which has all the standard cpanel hosting package utilities available. As this is a very simple task, low bids are expected.