Well, in this case a different approach is called for. Rather than moving a site from a proper category with regional, we are often willing to consider a second listing.
If the site woner reads the guidelines for Shopping, and the site fully qualifies (requirments include, but are not limited to pricing and the ability to do a complete order over the web - including delivery) then I would encourage a second submission directly to the single best Shopping category.
A cautionary note -- there is no third submission option.