title: how to restrict price range in google shopping API
body: <p>I'm using the Google Shopping API to try to retrieve products that have an "order" of magnitud of a certain number, or approximation to this. For example If I would to select products that are between th $40 - $60 price range : $50 +/- $10. What should I add in the URL search string?</p>
  
  <p>I know I can rank by price like this (according to the API):</p>
  
  <pre><code>     GET https://www.googleapis.com/shopping/search/v1/public/products?key=key&amp;country=US&amp;q=%22mp3+player%22%7Cipod&amp;rankBy=price%3Adescending
  </code></pre>