I just go into the amazon kindle store, search for terms like "fly fishing", "fly tying", or just "fishing" for example. Then I sort by price, lowest to highest. It took me a bit to find it the first time, but you can bookmark it after you get the search you like. Then I just check the bookmarks once a day or so. Only takes a second or so. Sometimes weird things show up there, but it's not to hard to do.

Here's one for example.

http://www.amazon.com/s/ref=amb_link...ing&sort=price