You can now borrow some ebook editions of The Two Moons of Rehnor series from the library? Right now, to my limited knowledge, only the King County Library System (KCLS.org) and the Washington Anytime Library System are carrying them. But, if your library system uses Overdrive, you can request they purchase the series through their normal request channels. What a great way to stay caught up on this looooong series without costing you a penny!
Note: The good folks at the King County Library System also have The Boy who Lit up the Sky available in paperback!