I meant your Amazon library, sorry I wasn't more specific! Alas, my public library rarely has any of the books I want to read available for Kindle.
According to Amazon, I already own books 1, 2, and 4 in this series and no others. I'm sure that means each of those have been on sale at some point. I'd hoped to fill in the gap with book 3 before starting the series (because I'm sure I'll love it per my rarely wrong KB-enabler-peeps!), but may need to go ahead and start reading. It won't hurt so much to pay full price for Book 3 if I've gotten the others on sale first!