Dragonheart- Dragonriders of Pern book

I bought Dragonheart which is written by Tom McCaffrey. It was published in 2008, though I never saw this book until at WalMart today, and it is a continuation of Anne McCaffrey's Dragonriders of Pern. I hope to be able to read it soon after writting this 4-6 page essay that's due Monday. (I won't even finish my English homework until after it is due. Grrr) http://www.toddmccaffrey.org/ Here's his website, which is set up very well. I wonder, since WalMart did not have ANY of the other books he's written, where I can buy THOSE. I would definitely love to continue my hunt on reading ALL of the Dragonriders of Pern novels that has been written. So far my rate is 8/??.