Website that reads XML like google shopping

Hello,

I need a website that will read a XML for google shopping and input the website.
So the user sees like an ecommerce, but when he clicks on the product he actually goes to the seller’s website

I will also need an admin to control whats is on the homepage.
Sellers will have monthly plans, so I need to control that too

Just like this one: http://www.iloveecommerce.com.br/

I can get into more details.

Thanks,
Bernarh