Here's what's going on there: Google figures, from your query, that your intent is probably shopping. And those are the top 4 results from the shopping corpus. If you click on the "Shopping results for..." link, you can see the full shopping corpus.
I don't really know how the product corpus works, but AFAIK Google is not being paid anything for those results. They're compiled from a bunch of commercial sites across the web. Google gets paid when you click on the ads, which are clearly marked at the top and right hand column.
Comments
Here's what's going on there: Google figures, from your query, that your intent is probably shopping. And those are the top 4 results from the shopping corpus. If you click on the "Shopping results for..." link, you can see the full shopping corpus.
I don't really know how the product corpus works, but AFAIK Google is not being paid anything for those results. They're compiled from a bunch of commercial sites across the web. Google gets paid when you click on the ads, which are clearly marked at the top and right hand column.