It depends on the breeder but generally fems produce more hermies then normal seeds. For a good pack of fems you should plan on having 80-90% females and 10-20% males/hermies. Really bad breeders will produce extremely mixed results (anywhere from 50-50 fem to hermi ratios or much worse with some men thrown into the mix). In any case, just buy normal seeds, sex them out, and then clone you're best females. Starting from seed every time is a pain in the ass. At least with clones you know, the quality of bud you'll have will always be the same and you know it will be female every time (permitting it wasn't stressed to hermi).