In my experience, it’s product-related blogs that tend to do best with Amazon. Most blogs probably have at least some possibilities (for example here on ProBlogger I occasionally link to a book that relates or a computer or electronic tool that I think might be useful to bloggers) but the reality is that this blog will never convert as well on Amazon as my photography site.
Deliver newspapers every morning if there's a route in your community. Find out if there are routes available in your area by contacting your local newspaper. Collect your bag of papers each morning and ride your bike from house to house to hand them out or have your parents drive you around. Most newspapers have to be delivered very early around 5 a.m. so be prepared to wake up at the crack of dawn.