Solar blankets most definitely work and help heat your pool. They are one of the easiest and most cost effective methods for heating. How much do they heat your pool? Thats dependent on a lot of variables, such as initial pool temperature, sunlight, temperature fluctuations (day vs night), pool size, etc.
There are many reasons to sell on Amazon from the hundreds of millions of Amazon customers who can see your products to the ability to start selling fast without the need to create a new standalone website. Learn more about the benefits of Selling on Amazon.
If the company won't provide them for free, invest the $10 to order one of its books from Amazon. You want to see how the books look and feel. Most authors I work with do not ask for samples, and this is putting a lot of faith into the hands of a company that's producing something so important to you.