yes they do carry them but their own breeds are not stabilized, hundreds of seeds need to be grown out to select the best for breeding and the basement growers are just femanizing what they think looks good. Like I said before, the real breeders are not on reserves, they are in Spain and Holland where this science all began and most are now dead or writing for High Times.
I certainly do NOT have the grow experience of most here. But I DO have more experience partaking than most, 30 years of experience.
What is written above is so important to understand.
A new "strain" is made every time sometime creates seeds intentionally or otherwise. The vast majority, simply stated, suck.
Even a stabilized and consistent strain can suck. So what is the "best?"
It is, quite simply, when someone has run through dozens or even hundreds of seeds to find the very best pheno...then clone or feminize it.
The reason why some bagseed can be WAY better than even seeds bought from a well known breeder is because of that selection process.
Many of the very best strains now have somewhat unknown parentage...for this reason. They have an incredible pheno but may not know where it came from!
Getting a seed or a clone of a strain you have personally enjoyed is the very best option imo. All other options require some luck or a very, very consistent strain.