There are many service providers who claim to get you higher PR for your website. You need to be careful in choosing right provider. These link building service providers will take up the job of posting links in prominent and most popular sites which are related to your site topic. I Sell Page Rank is one of the service provider whom I have come across in this field who is doing quite a decent job. They do 100% ethical, non black hat method and manual labor which ensure organic SEO on your website. All their links are guaranteed to pass page rank.