You can buy backlink via Link Sale in Digital Forums. If you don't care about niche type of website, you can contact me. I have some site with good PR to sell textlink.
I'll suggest don't buy the back links because this has the negative effect in Google, you can search for their latest guidelines and topic regarding buying backlinks.
I don't think buying a link would be a good option now. As mentioned by Google that buying of links for the sole purpose of increasing your rankings is not good for your site. Also, why do want to pay for a link when you can generate more related links by yourself. You can follow these steps to generate quality and related links. 1. Make directory submissions to Yahoo, Dmoz, and other quality directories. There are quite many number of free directories if you don't wanna pay for it. 2. Write articles related to your industry and publish them on popular article publishing sites. In this way you will not only get lots of links but will also get lots of traffic. If done correctly this could rocket your traffic and sales up high. 3. Link exchanges. I know link exchange nowadays won't make much of a sense as people think it doesn't help much. But let me tell you exchanging links with 10 to 20 quality sites won't hurt. But make sure that you don't end up creating a whole directory with link exchanges. 4. Post in forums - You can chose the forums related to your industry and post in them if you are an expert in your industry being active in the forum won't only generate you links but also earn you some business. These are just a few tips to start with. There are many other ways too. But I would advice just do this much for the start and the it would be okay if done efficiently.
You will need to check how many back links your site has got.Just because it has been on line for ages doesn't mean that people will have started to link to it? Folks just don't sit down and add links to other websites at random. A webmaster needs to be very selective as to what sites start linking to them and who they link to. Just paying out cash for links will not get your website anywhere at all let alone showing up in SERPS quickly.
Its very risky, I'll prefer to buy content writer instead of buying links Google penalizes website if found buying links, or doing paid link exchanhe