If you are considering paid backlinks then you can huge number of people offering this for some small amount of charges. If you are considering free links then its better to search on Google on places where and how you can get backlinks. Simplest ways are article submission, links from forum signature, directory submission, social bookmarking etc. There are many and you should know how to get those links efficiently.
Article submission link exchange social bookmarking forum posting blog posting.. helps to get backlinks
Article submission is easy and best. You can Download any article spinner which can spin your one articles to many different article and can also submit it to articles directory. Its very easy process. But you need to be very careful while spining your articles, it should be readable. I have tried Spinner chief, it is free and easy to use. But you cannot download it directly, you need a link from any registered member. You can download spinnerchief from here.
Forum signatures, article submission, buying links, directory submissions, and social bookmarking are great ways to build more backlinks.
I agree, these are most popular way of building link, but you need to spend lots of time building these links. If you have time then go for it.
in today there is no time to do link building need some automation. tell me any automated sysem for link building