As far as I'm aware, all Dutch and English cannabis seeds banks ship their seeds discretely. AMS is so discreet it hard to find the seeds in the package yourself. Seedsman sends them out plan envelopes and the seeds are protected in a little plastic box.
They all pretty much do. Check out the Cannabis Seed Banks forum and click on the Current & Legit Seedbanks. There are also lots of threads with good info on discreet seedbanks.