Google Product Search API - See merchants and prices

Question

So I am trying to get the list of sellers and prices as seen here (as an example)

http://www.google.co.uk/products/catalog?q=call+of+duty+modern+warfare+3&hl=en&cid=3184753655595438210&os=sellers

I am trying to do a product comparison of single products, and need to use the data here to pull into a database and store.

Using Google's shopping search API (as below) I expected it to return this info, however it only seems to return products without that list of merchants.

http://code.google.com/apis/shopping/search/v1/getting_started.html

and

https://www.googleapis.com/shopping/search/v1/public/products?key=########################################&country=gb&q=call+of+duty+modern+warfare+3&alt=atom

My Question: How do I pull a list of merchants and their prices from the google product search API. If its not possible, are there any other feeds or such I can use to do the same thing?

Edit: Been playing around with the crowdBy rule but still cant seem to get it to return multiple vendors for each product.