Of course I used a chance to get it with a reduced price, but it took me a while how to use actually move from email to the buying process. Take a look at the screenshot and try to tell what you're expected to click on if... there's no any big visible button or a link (no, the price tag isn't clickable!).
Correct answer is the big image. Yes, I had to click on it on order to get a web site. This email definitely can have a better conversion if there is but CTA.