How To Grab Prices From Feeds

Can some one please tell me where I need to look, or how I can update prices on a website using feeds.

So say I had one product from 10 merchants, I just want the script to look up the price and stock in the feed and display in a table.

Any ideas...

php and curl...
Basically you need curl to make the connection grab the website source. Then you need to parse it so that it grabs the information that you need.

Unless of course the merchants have a webservice or api then you can always use that as well.

I know its brief but no use getting into detail on either if you dont know what the merchants provide.

Look at SimpleXML for parsing feeds, makes it a lot easier than trying to do it by hand