In searching out prices for the other books in A A Attanasio The Perilous Order of Camelot series I found these 4 free at Kobobooks.com. The links follow:
The Wolf and the Crown -
http://www.kobobooks.com/ebook/The-W...nAw/page1.html
The Serpent and the Grail -
http://www.kobobooks.com/ebook/The-S...qNw/page1.html
The Eagle and the Sword -
http://www.kobobooks.com/ebook/The-E...HVg/page1.html
The Dragon and the Unicorn -
http://www.kobobooks.com/ebook/The-D...yAA/page1.html
I don't know in which order they were published, I just quickly grabbed them and came here to let others know. I hope the links will work, if not just copy and paste the the addresses.