Pig mode in Vulcania? You must be somewhere in the U.S.?
As a Canadian, I've always found HMV pricey, even on their web-site.
But CD's in Canada have historically been lower in Canada than the U.S. so maybe that is what caught your attention. Why (the lower prices), I don't know, but its been that way for quite some time. Unless I am desperate for something that is impossible to find here, I would rarely order from amazon.com or cdnow.com in the US. Pricey for us Canucks, particularly when you factor in shipping costs across the border.
Unfortunately, the "best" Canadian online CD store closed down earlier this year - and that was Sam the Record Man. Their stores in Toronto are still going strong though.
Try chapters.ca and compare prices. I'd be curious what you think.