thanks for the comment mate!
yeah - we currently actually work with a heap of retailers and we do match to where you buy them - we've around 90 or so at the moment (love to get your thoughts on http://about.crowdsend.com).
publishers can do a bunch of stuff too - but we think the bigger problem rests with the community than with publishers.
basically once a product's been identified then we match it to a bunch of retailers if we can find it!