yes, it depends, on the type of blog, the traffic on the blog, etc. also on the pr of the blog, you cant get a pr7 blog for $5.
Thank you for the replies. Is www.payperpost.com a good way to go? What are some other ways I can get the word out besides this fine forum?
There are various services available. I offer a blogging service, and so does Col (Cheap SEO Services). Col uses my blogs in some of his services too. http://forums.digitalpoint.com/showthread.php?p=1869452#post1869452
There are plenty of people here who will blog about your site/products - you just need to make them a fair and reasonable offer. a few $ will get you a few words, a few more $ will get you a well written, well researched unique article with embedded links about your site.