Quality linking matters. Don't buy links instead be worthy enough to be linked by others.That work for longer run.Other than that there are some sites which does offer free backlink with do-follow.Use those services,blogs,forums.

More significantly if the sites that have back links to your site have a high google page rank then google will give more value to your site and as an outcome your page rank shall improve.

Hi, I completely agree with you friend. In these days the competition is ion his way, so get rank in google SEO is essential. Here I want to reveal one point on backlinks. The expert say  SEO is a slow, but effective way to get rank. Though it will take some time to bring out the proper result, but its effect lasting for long days. Interesting thing is in these days nobody wants the slow procedure. The site owners (how new he/she is, not a factor) want rank in superfast way. For that only good, SEO friendly backlinks can help them, if they want it instantly the trading links is the best option. If you are interested to trade such effective links, I can help you.Reply soon.