Not any more there isn't, you have "SEO" in your username and don't know that PR is no longer accessible to the public. #facepalm
The best advice I can give for this question, is to search Google in this manner: (your keyword + write for us) This will return websites who allow guest posts/articles. Next, you will want to use one of the SEO tools to check the websites you are finding against their rankings. I hope this helps.