The only reason to buy links for your site would be 1) to generate traffic directly from the links themselves, because they will be seen and clicked on by people you want to get to come to your website or 2) because they can help increase the rankings of your blog posts which can bring in more traffic from the search engines, (specifically Google)
And you still only do that if you are willing to assume the risk that if the links are identified as paid links by Google, then they will punish your rankings drastically.
Are you sure you need to buy any links though?
You may not have to buy them at all or you might be thinking of getting them for the wrong reasons.
If you aren't actually targeting specific keywords with your blog posts or homepage, then you really don't need them at all. What I mean by that is that I wouldn't bother working on links at all unless I was specifically trying to get more traffic from Google. If that is where you want your traffic to come from and you are writing blog posts with titles that are intended to attract traffic from search engines, then the links could really help. Otherwise, the links aren't going to help you in the ways that you expect them to help anyway.
There are also ways you can get links without buying them. The place to start is to figure out who you want your audience to be for your blog. Then figure out how you can let those groups of people know that your website exists. For example, you could join a forum that is relevant to your niche and have your website URL appear in text below every conversation you have on that forum. Look at my signature on here for example.
You can launch free blogs on Web 2.0 sites like blogger, blog.com, tumblr.com, etc. and write additional blog posts on them. And have some of those blog posts link back to your blog.
You can make friends with other bloggers. Then you allow those bloggers to write guest blog posts on your site in exchange for letting you publish your guest posts on their sites.
And if you absolutely insist on buying links and you don't know good places to buy them from, then I suggest you ask people you trust. But don't ask them in public like on a forum like this. Ask them in private like through email or through a private message on the forum.
Hope that helps!