The Vault, Alibongo, Herbies, Autoflower Portal Giftshop are excellent reputable banks, The first 3 have huge inventories of seed from various companies and the last have a small selection of highly regarded auto strains. There is a small chance that you could get a male from feminized seed, but very unlikely(something like 99.5% female on femmed seeds)
Whichever bank you choose, make sure you research your strains through various sites reviews(leafly, here, seedfinder.eu). Good luck!
