Web crawler to track price changes of a number of websites?

Hey all, I'm thinking of setting up a website which can send out web crawlers to a number of computer parts websites and then collect the data and display it on my own website (name of the computer parts + the price associated). This is done so that people can take a look at the website and determine the cheapest price for the same component offered on a number of websites.

Any suggestion for a web crawler that can do something like this? The crawler should also be able to track the websites about four times a day.

NV.

Isn't that what pricegrabber.com does? I don't know what kind of engine they use.

Yes, but I want a similar service local to a country.

What you want is called a shopping bot.

http://www.filebuzz.com/files/Shopping_Bots/1.html

Any specific suggestion from that?

No, I never used any of them.

NONE of those scripts on that page do what Nouvelle asked. Did you just Google a phrase and plop the link in there? Junk. Sorry, but it's a junk answer. Then you topped it off with, "No, I never used any of them."