Using the finditemsadvanced service as part of eBays finding API, the documentation mentions filtering results to only include specific countries. However I'd like to exclude a small list of specific countries instead. Is there an option anywhere to exclude instead of include individual countries when querying for product listings?
No,
only Exclude options are ExcludeSeller and ExcludeCategory
or you have to list all the Countries you want in ListedIn or LocatedIn
perhaps MaxDistance option can be suitable for your needs..