Here are a couple of older ones:
The Werewolf of Plonkert by H. Warner Munn
http://www.fictionwise.com/ebooks/b3...ner-Munn/?si=0
Also The Undying Monster:
http://www.fictionwise.com/ebooks/b30335/?si=0
Like all old pulp classics, your mileage may vary.
One of the most famous is The Werewolf of Paris by Guy Endore. There is a Kindle edition, so there might be other editions out there:
http://www.amazon.com/The-Werewolf-O...=AG56TWVU5XWC2
Project Gutenbeg has one of the earliest werewolf novels, Wagner the Wehr-wolf, a penny dreadful from Victorian times:
http://www.gutenberg.org/etext/27202
I haven't read any of them yet, but they look neat.
Oh, and for a more heroic portrayal of werewolves, Marie de France wrote Bisclavret in the 12th century:
http://www.clas.ufl.edu/~jshoaf/Marie/bisclavret.pdf