In addition to the widely available public domain books, which are commonly free and include great classics, Amazon has a promotional program where authors can offer their books for free for a few days to promote sales. Many excellent and popular books can be had this way. The problem is finding them. Unless you land on a book that is being offered for free, there is no one place to search for the Amazon Kindle freebies.
For one, you could go to Google and search for “free Kindle ebooks” or “free ebooks at Amazon,” and among the results will be various blogs that come and go where the blogger lists a daily selection of ebooks. This is nice because the lists are often focused on a book type (fiction, business, computers, health, etc.) and narrow the list down for you. Enewsreadertoday.com and hundredzeros.com have been very consistent in such listings.
A direct, but broad way to find the free ebooks is simply to search at Amazon itself using the search phrase “0.00″. That will bring up pages and pages of unsorted ebooks.
A more refine way to search on Amazon is to use your usual search, with a keyword (such as “mystery”) that displays search results by relevance. If you then change this default sort order from “Relevance” to “Price: Low to High”, you’ll get a list of all Kindle books that match your search keywords but are available for $0.00.
Lastly, you can be more focused with Google by using the following search phrase:
intitle:kindle site:amazon.com "you save * (100%)" search-phrase
Simply replace “search phrase” with a book’s name, and author name, or a category (such as mystery or business). Then look in the left column on your Google results page and find the term “Show Search Tools.” Click that to open up more options. Choose the one show results from the “last 24 hours.” This helps because, otherwise, older pages are often shown where the free deal is no longer valid.