I'll bet the sales figures didn't justify the costs for the hardcover.
Unfortunately, probably not. The first book,
In the Shadow of the Oak King got good reviews, but about a year after it came out it was clogging up bargain book tables.
It was an interesting trilogy. Courtway Jones took the framework of
Le Morte d'Arthur and set it within a generally authentic fifth century Britain. The first book was told from the perspective of Pelleas, Arthur's older brother. The second,
The Witch of the North, was told from Morgan le Fey's perspective. The third,
Prince of Camelot, was from Mordred's perspective.