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...

JojoRizo's (RIP) Purple Elephant is basically a Purple Urkel hybrid or perhaps a selection from S1 Seeds. It's a massive yielding hashplant version of the urkel and is a very rare clone only strain. Only a few people in the world have her and the few people that do hold her close. It's finish time is roughly 8-9 weeks and yields rivaling that of Big Bud. Breeder, Gage Green, has popularized this strain using her in the infamous Grape Stomper aka Sour Grapes as can be seen in pretty much any recent issue of High Times.