Is it possible to make a website that pulls info. from another website to keep updated?

Hi Guys,

Sorry if the title was not so descriptive, and if it is in the wrong section. I had no idea where else to put it, as this isn't blackhat stuff, and it didn't seem to fit anywhere else.

I want to make a website, that has a s h o p p i n g cart built-in etc etc and I want to s e l l online c u r r e n c y for some games. However, I want to act as a middle-man, so:

There is website "X" which s e l l s the online currency, and the price changes every 10-20 minutes. Is it possible for MY website to "read" the information/pricing from website "X" and update MY website with new pricing to reflect the increase/decrease in price on website "X"?

Ie - Website X is s e l l i n g a good for $1.00 per unit. So, on my website I set it to upmark by 50% and I am s e l l i n g for $1.50 per unit. Then, website "X" changes the price to $2.00 per unit, can we make it so that MY website extracts this new updated price and then makes my price $3.00 per unit (a 50% increase on their new price) ?

I hope I have been clear. If I have not, let me know and I will try to word it better.

Thank you!

BTW: Why is my rep going down? Is it because I thank a lot of people? :/

Friendly bump, if someone is reading this... do you know why I have not had a reply in a whole entire day!? Maybe it is in a wrong section?

if the price in website x can be extracted using rss feed, and follows a structured format that is easy to do in php.