Have you already tried everything mentioned in this thread? Press releases, article submissions, free web2.0 properties like Hubpages? If yes, it really depends on your budget, chances are that if you buy cheap links, you will get cheap links, but also expensive links are not necessarily better. You have to investigate carefully before you depart with any money. In general it is better to get a few, high quality links from sites that are in the same niche than to go for thousands of links that are low quality and have nothing to do with your sites subject, SY