One of the first thing that normal webmasters do after building a site or blog is to build links. Link building is one of the most important part in the search engine optimization process. In the old days, webmasters build links by exchanging links (reciprocal linking) but since Google changed their algorithm, one way links are so much more better than reciprocal links.
Since Google changed the algo's, many new (and experienced) webmasters had a problem. Finding natural or free one-way link(s) for a new site or blog is nearly impossible. Unless you're blog or site is providing a service or web tool that a lot of people use, getting one way links is nowhere near possible.
The solution? You'll have to buy one way links. Although some webmasters agree that it is not ethical to buy links, most webmasters choose to ignore this and it seems that the process of buying links is now on the 'grey' side of SEO.
If you want to have a look at how much it really cost to get one way links, have a look at http://www.4th-media.com/link_building/. I'm sure you'll be pretty surprised