How to Save on E-Books for Kindle, Nook and Other E-Readers

If you're among the millions of people who got an e-reader for Christmas and are reading more books than ever before, you'll soon notice on your credit card statement that those $9.99 books add up fast.

But other than reading free public domain classics, how can e-book readers save money without getting a monthly credit card bill in the double digits for the many more books they expect to read with their new toy? There are quite a few ways, as I discovered after some research, with some e-readers offering more ways than others to get free or discounted books.