where to get high quality contextual backlinks from blog networks?

Hi everyone, as stated, do you know where to get high quality contextual backlinks from blog networks, or any place i can buy such service or backlinks, which allow you to post articles with 1-3 keywords in it to their high pr private blog networks, of cause the affordable price is better.

aren't there any in the BST section in here?

There are many quality services in the BST section. Also, you can scrape sources or just go old school and manually go through Google. Many different options.