I don't think it is allowed here at hubpages. It is against google policy to write sponsored post. I have a blog at blogger.com before but because of sponsored posts my blog was on guard and flagged until they shut it down. Just glad that my adsense were saved, it's a warning maybe.
If you want to write sponsored post you have to own your own domain name. Make it rank until you get the PR2 to get a good paid blog. Having PR2 is a lot of work on link building and promotions. Good luck!