There are countless seed banks across the country that will ship to you. The one I use was only for medical cannabis before Michigan went totally legal it has some of the best breeders with super strains and genetics.
The art of growing has gotten much easier in recent years. Autoflower strains make life simple, germinate seed, tender care for 9 to 15 weeks, no lighting changes, and voila...buds.
https://www.seedcellar.com/
Outside of the breeders represented this is a totally U.S. business plus is located in my home state, Michigan. I try to support more local businesses.
Another is here, like some of the strains there.
https://www.seedcellar.com/
https://www.cropkingseeds.com/
https://www.truenorthseedbank.com/
Youll find that most seed banks represent the same breeders, find a bank that is best for you ...ease of payment, shipping and so forth.
The breeders I like to use are World of Seeds and Mephisto.
Shop around but Ive found most seeds are about 10 bucks apiece. They come in packages varying in amounts of seeds packaged in airtight vials.
Have fun...it can get confusing and overwhelming just in the sheer amount of stuff out there.
Welcome to the world of cannabis growing. You cant get addicted to cannabis, but you can get addicted to growing it. Been growing for about 12 years.