Christine First Edition jacket price 20.95

[bcsunshine909]

Hi,
I have, as I believe to be a first edition. All aspects of the book match to being a first edition however, the dust jacket price is $20.95. The back of the jacket has the ISBN 0-670-22026-4 but this ISBN number is not on the inside front of the jacket by the price. I know that it could have been replaced with a later print jacket but I feel that this may not be the case. Is it possible that this is a Canadian price and jacket ? I would appreciate any insight.