Its not a breeder or seedbank, clone only strains are only available as clones. Mostly they are special selected phenotypes of a commercial strain, or old classics who was keeped by someone somewhere...

The story of Aloha's White Widow is that someone working for Aloha clipped a cutting from the original Greenhouse White Widow mother (shatibaba's at this time, so look out for the black widow instead) entered into the Cup and displayed at the Cannabis Castle that year.