If you want to get Harry Potter books in the "British" or "Canadian" format (they're the exact same kiddies, but the Canadian will be cheaper for you Americans),
You can order from:
www.amazon.ca (Please note the " .ca ", not .com !! .ca means Canada, so that is the Amazon site for Canadian orders) or
www.chapters.ca (which is kind of like your Barnes & Nobles or BORDERS)