1. You can get SAVAGE DRAGON direct from the artist, so I'm guessing his asking price would be the reasonable price. No dealer or evil rep mark-up prices. HOWEVER, he likes to sell his art as complete books, so I think that accounts for the lack of pages 'in the wild.' It takes a special kind of heartless collector to be the first one to scatter a book.
2. @alex_johnson will probably be along to post his pricing guidelines, but until then you may find them tucked in the NEW TO OA COLLECTING thread