Hello Sarah. Welcome to MobileRead. Like you, I love my Kindle.
You'll find lots of books for your Kindle right here at MobileRead. There are also free books at Feedbooks, ManyBooks, and Muncey's. If you like Science Fiction and Fantasy, go check out all the free books at
www.baen.com. Then, if you liked those, you can purchase more from Baen's Webscription site at
www.webscription.net.