you can achieve more traffic and visitors. i think use some off page SEO activities: Directory Submissions Social Bookmarking Submission Article Submission Press Release Submissions Blog Posting Blog Commenting Forum Posting Review Posting Rss Feed Submission Css Submission Social Media Optimization
I don't think it will be cheap if you are talking about BUYING the traffic. There may be some other methods you can achieve traffic without buying, they might be Bookmarking Articles Blogs Forums Directories and Social Networking