I found out
Buy Blog Reviews as a Google Adword.
I registered, submitted one of my blogs and it was approved. But not many opportunities at present. In fact, there is only one right now.
You can accept offer only if it is related to your blog's topic.
Just a review:
Loud Launch is silent.
Blogsvertise has nothing to offer for more than a month.
Payu2blog is always active.
Shared Reviews pays too low.
Lite Reads also pays very low.
Buy a blogger-advertisers contact bloggers directly. No contact so far.
Hope this post helps someone.
Cheers.