As one of the pilot brands in the launch of the Pinterest API, Random House has launched a Pinterest-powered book discovery tool as a responsive microsite.
You can see how it scales down at various breakpoints:
As we've mentioned before, if you're not ready to do a full-on responsive redesign project, you can try your hand at a responsive microsite. Other ways to "dip your toe" include running responsive email campaigns, or designing for tablet breakpoints, rather than the entire site all at once (provided you're using a mobile site provider to deliver an optimized mobile experience in the meantime).
For more information on responsive design for ecommerce, check out our post archive and our on-demand webinar Is Responsive Web Design Right for Your Business?