The best way of finding book reviewers is Goodreads. I have already mentioned that with the help of the Book Blogs Search Engine I had already found roughly 400 book bloggers. With the help of Goodreads I later managed to find an additional 600.
How? Go to Goodreads.com and type into the search line the title of the book or author you have chosen. You will find many reviews for that book. You can then click on the name of the blogger who wrote the review and you will get his or her profile. And if you find an address of their website there, click on that.