I’m curious about:
Skyridge (German)
EX Emerald (German)
EX Dragon (English)
HeartGold & SoulSilver (German)
Couldn’t find any on eBay at all, but maybe I just didn’t know what to type into to find them properly.
Honestly you may as well keep them for storing cards. You would be lucky to make $5 on any of them after fees/shipping imo. Especially used and other language
I agree that the foreign ones will probably be hard to sell. Perhaps you can get around 10USD or so for the EX dragon box though 