With any clone only strain, your best bet for seeds will be S1s or a backcross from a respected breeder. I can't think of anyone doing a SCBD backcross off hand, so I'd either go for the S1s or try to find an authentic SCBD clone-which may be hard to impossible due to the astounding # of fakes. It was a good clone only strain back when the clones were everywhere in the Bay Area during the Medical only days. Most seeds you are finding, like HSO (which was kicked out of Spain and now resides in Austria, hahaha) do their own "blue dream" crosses, which is random haze X random blueberry....the problem with that is, the market is rife with terrible hazes and even more terrible blueberries. You really want the original if you want the true Blue Dream experience.