1. Barneys farm very high in THC but they dont like stress
2. Fastbuds for autoflowers
3 recently im trying supersativa seed club, an oldschool seedbank since 1985, looks really great, the strains looks stable and strong
4. Dutch passion has some good prices and a quite good seed bank
5 an interesting seed bank is Humboldt seed organization (the one from the pictures)
But if you really want to avoid hermaphrodites at all cost the best is to grab a regular seed, wait and check until it shows her sex, get clones and work with that, because most of the feminized seeds can show some balls from time to time (stress or whatever reason) it happend to me with Barney, with RQS, with greenhouse, but just 1 single plant with 1 or 2 balls here or there, no big deal because i remove them and all good, its not that the whole plant is full of sacs, call it genetics call it my own mistakes by stressing them but in general with regular seeds you avoid a lot of these troubles