Concise use of media queries, Page is neat and responsive :)

[Tiarama]

If I'm gonna be reeeaaally picky - The smallest screen size in circulation is 320px, the content in your nav bar & promo header starts to wrap at around 358px.
A user-friendly way to accommodate this would be to make title-text and page content a little smaller for phones. This way you can also allow more of your products to fit into a grid for mobile users, rather than one long column :)