Email marketing is considered to be a form of direct marketing which is quite popular with the advertiser as it enables them to contact the target consumers by themselves. So if you are using it for promoting your website and want to make sure that it is cost effective then you can buy email address or buy opt in email through the online media companies that maintain such information. When you buy email address then you basically the database that consists of email address of people who are interested in knowing about your products. They have subscribed or chosen to receive the emails related to similar products and thus you can use them to promote your website better. When you buy email address and use it in email marketing then you get to send the emails to the people who are actually interested in your products. This way your email marketing campaign is able to enjoy a better click through rate and you can ensure that it is cost effective as well. One can buy email address or the opt in email list through the online media company that collects them and maintains and updates them regularly. It is available at very economical price and is apt for the website owner who needs to get quality traffic at their site.