If there are amazon links, they are probably affiliate links. One way to get around this if you do not want the affiliate referral is to search for the name of the item through google. (You may already have existing affiliate links from other referrals from other sites in your cookies however)
The DoubleClick cookie
The DoubleClick cookie is used by Google in the ads served on the websites of its partners, such as websites displaying AdSense ads or participating in Google certified ad networks. When users visit a partner’s website and either view or click on an ad, a cookie may be dropped on that end user’s browser.
- Google’s use of the DoubleClick cookie enables it and its partners to serve ads to your users based on their visit to your sites and/or other sites on the Internet.
- Notify your site visitors of the third-party vendors and ad networks serving ads on your site.
- Provide links to the appropriate vendor and ad network websites.