As Honey said, try and make it look as natural as possible. Buy in content links, and buy them from related sites. Vary your anchor text. Link Building is very and truly alive, and even with the Google crackdown, it is a herculean task for them to sniff out every paid link.
Don't listen to these dimwits. If your site or clients site gets caught and or banned(fairly easy to do) you are done for, for approximately a year. Backlinks can be found and researched. SEO is a fairly, no, a very competitive field. Folks will straight up narc on you as well if they catch with dodgy links. If you think about the end user, the money will come. If it's worth doing, its worth doing right. Nigel
If your going to buy them, then I have to agree that buying them from relevant, quality sites is the only way to go.
Buy links does help although this method is usually expensive. The most important thing from buying link is buy in-content links because in-content links look like natural links. How about link from directory or similar sites like that? Well, it is not considered in-content link. Also, get it from relevant sites.
if it is not a bad,link building ,but i prefer natural links, but i dont know how much cost will be,per month for links purchaging.