Thanks for the replies and you're right - looking at fictionwise and other such sites shows the same pricing as the Sony store, down to the penny actually. That makes me feel better about Sony and much more frustrated with the publishers in general.
It'll be interesting to see if the recent announcement that Google is going to create an ebook distribution service will have any impact on how publishers approach to ebook pricing. The more widespread and "mainstream" digital distribution becomes the more likely we are to see better pricing I would think.