Hello (again!) Karianna,
In the directory, you can filter using the 'More Options' area, as in this image:
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This works both for browsing or searching the directory. (So do your search first, then use the filter)
Note: We're doing a few tweaks over the next two weeks to the relevancy of directory results; right at the moment you might have to go through a couple of pages to find the perfect supplier for you