Did you know you can back links for free on good sites just by calling people on the phone. Check the domain in the whois directory and call them up. Most people aren't in marketing and could care less; they will ususally put in a footer link if you can convince them it will help them.
Link purchase is not recommendable. Your competitors have eyes and a paid link reporting tool in their webmaster account with google. They only need to submit a report for locating a link like that and Gogle will get very angry with you.
In Dp also have buy and sale links section. Just go business thread and you can find a lot of links sale there. Just make sure that you able to estimate the trend cost. Thanks
Why don't you just create some content, and then hire someone to submit it to you giving you real, actual backlinks. Your problem is that if you buy links, you are usually buying links from pages that have nothing to do with yours, so it doesn't matter what the PR is.
don't buy links! that's suicide! try contacting blog owners one by one to write about your web site.. of course, first have some interesting content wrothy of mention..
Buyblogreviews has some decent blogs. But the most important thing when buying links is doing a good analysis of the blog your buying the link: traffic, pagerank, content, inbound links... and overall quality of the blog