We've set up a new account for those who have Amazon Prime, which allows people to receive free shipping, which is great but it required us to make a whole new listing for the book. This means all the reviews submitted on my past amazon listing are not on the Amazon Prime one, so.....
Go to http://www.amazon.com/gp/
Scroll halfway down and click 'create your own review'
Additionally, a digital version is in the works!