Loren Baker from Search Engine Journal wrote a great guide to buying links, directory listings, and paid reviews for blogs. Loren does a great job of breaking down all the different vendors that sell links, paid reviews, and directory listings. Loren also covers tips for purchasing links from these sources.
Text Link Ads is probably the most popular of the link ad companies, with over 10,000 publishers in their network and a lot of promotions and advertising on SEO and publisher industry blogs and sites. Link prices are based upon the authority of each site and charged per month.
ReviewMe is a more targeted approach to paid blogger reviews. Advertisers are given access to ReviewMeâs lists of niche publishers, and can request reviews on specific blogs (and only those blogs), instead of using the mass review approach. The end result is more thoughtful content and reviews of your products, for a higher price. Pricing is set per blog and based upon that blogâs popularity, readership and incoming links.