Come to the Netherlands. You can buy weed seeds legally here :D. You can even buy whole plants. You can have a maximum of 4 plants in your possesion though. Tip: Buy the seeds, mix them with other seeds, or hide them in dirt and mail them to your country of residence.
Buy some shitty weed and use the seeds that come out of that. Or you could just straight up ask a dealer and im sure they'd sell or give you a few. Also I'm not 100% on this but i think wall street market might have a section to buy seeds, but i might be thinking of Olympus that is now down