If you send me 500 words unique article, you can add 2 links within the article for free. You can send me as many articles as you want. But links need to be related and also article's niche, e.g. to hotels, some services etc...or you can just add informative sentence on top and bottom of the article, like: this article has been written by your_site.com
If you wish me to add links to any existing article (or to suggested article), the price is $1/link/year (at least 10 links to order).
If you have some service that you would like to offer to visitors of a particular post, you can add advertising text (250 chars + title + link) in the bottom of the article for $10/year.