Fetch offers from different Sites

Hi BHW,
i need your help.

What i would like to do is the following: For my site i would like to create a section where the user can select a service + location and my script fetches ~20 different other sites that offer that service to see if there is any available and list them.

Can i buy such a script or do i have to do it on my own?
Whats the general approach?
There are no APIs on the vendor site, so i could just scrape their database and build my own one and update it from time to time.
Or i do some kind of live fetching what will become complicated and a hugh waste of bandwidth
What would you do?

Kind regards,
Okidoky

Whenever I have a complicated scraping project like that, I go to Elance.com and post a project. You will have to wade through some awful bids, but you'll almost always find a great programmer that can create a custom solution for you at a great price. It's always worked for me, and I've had some weird scraping programs built.

Thanks for the Tip. Ill try that

currently I'm working on similar strategy ... If you are programmer look for .xml because it's easier and less complicate to other methods .