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On the Dutch Amazon they are still available. You could also look at different countries.
I'm into pokemon, but like a lot. After getting all the video games for game boy (no spin-off), I got into the physical/digital TCG game. Pokémon is love, pokemon is life. And now after reading Vol. 1-7 I'm waiting to get my hands on these Adventure Manga
If you are based in the US, you'd want to get these. I don't know if a link is allowed on the sub, so remove the spaces and you should be good to go.
https://www. amazon .com/Pok%C3%A9mon-Adventures-Gold-Silver-Pokemon/dp/1421550075