You can now download Anne McCaffrey's The Dragonriders of Pern omnibus for only 1.99$ here.
Here's the blurb:
Finally together in one volume, the first three books in the world's most beloved science fiction series, THE DRAGONRIDERS OF PERN, by Anne McCaffrey, one of the great science fiction writers of all time: DRAGONFLIGHT, DRAGONQUEST, THE WHITE DRAGON. Those who know these extraordinary tales will be able to re-visit with Lessa, F'lar, Ruth, Lord Jaxon, and all the others. And for those just discovering this magical place, there are incomparable tales of danger, deceit, and daring, just waiting to be explored.