title: price comparison website - crawler
body: <p>i have got a price comparison website.
  You can click on a link of an offer and i'll get $1 from the shop.</p>
  
  <p>The problem is: crawlers crawling the whole website. So they "click on the links".
  How can i prevent them from clicking? Javascript is a bad solution.</p>
  
  <p>Thank you!</p>