Become.com uses automated crawling technology to identify shopping-related web sites for inclusion in their index. They are particularly interested in sites containing shopping-related research information such as buying guides, reviews, articles, specifications, forums, etc.
You may have the ability to add and or modify an htaccess file on your server. The htaccess file can be used to control the bots at the server level. Add the following to the .htaccess file on your server to block specific bots from visiting your site. Be sure to replace the Enter User Agent with the user-agents for the bots you would like to block simliar to the user-agent (BecomeBot) listed in the example below.