I just discovered this today. Go to Amazon.com and click on a product, then scroll down to the bottom where you will see the ‘Looking for specific info?’ search box.
Then enter a query.
It is Amazon’s own model, and I am assuming it is trained on its products, I don’t know how powerful it is but I am playing around with it. Just thought I would share.
Are you sure that's not some sort of Amazon addin (e.g. Keepa or Jungle Scout), because I tried both .com and .co.uk, and just got the usual Reviews and Q&A results?