Order directly from the breeder with seeds in breeder packs if you can. Otherwise freshness and incorrect seeds become issues. For US customers, mephisto (autos only) and Growers Choice (autos and photos) will ship from inside the US. Many of us greatly prefer autos, and mephisto is hard to beat. They give great freebies, often twice as many seeds as you order, in direct orders. Breeder is probably the most important thing. For other countries, or for non-US purchases by US citizens, Sensible seed bank is highly rated.
Www.SeedsHereNow.com is a great US seedbank, but pricey. Great strains though Alibongo has great prices and selection, but located in UK and charge cards in China. They’re legit and ship stealth with good freebies. I just bought from The Seed Source at a show in Portland, and got like 30 freebies and good prices with all my favorite breeders (Ethos Genetics, Exotic Genetix). I think they’re on Instagram