Check for wwi promo code exclusions. wwipromo codes sometimes have exceptions on certain categories or brands.
These offers are usually only available for part of the day because they're considered exceptionally good, but lately wwi has been offering it all day long
Look for the blue "site-wide" label for site-wide wwi promo codes. Site-wide codes can be applied to any item on wwi website, and therefore are the most useful codes.