[altonroot]

Both are good, but I have words to say for both. Email marketing is best in terms of cost. But at the same time I believe that you should have email list of subscriber of your website. Purchase list from other persons might not be the best way. Send attractive offers in inbox to your subscribers, there is high chance of conversion as they already trusted you. In the case of affiliate marketing, you need higher profit margin because affiliate marketer demands high percentages against their efforts. So you must do email marketing and send out emails regularly when you have something new to your subscribers and to those who have purchased once from your website. Email marketing requires a simple software. Affiliate is thinkable option but it is good or bad depends on scenario.