I can send you S strain rots, Tetraselmis, Isocrysis, and you can get Nannochloropsis from any LFS. You can get the DT's but view it under the microscope because a lot of the cultures are mixed. I know of a local phyto grower that started to mix her phyto after a post I made that explained how to grow their own. Ultimately though the Nannochloropsis should start to take over the culture if it is mixed with others (so I hear). The only thing I know that will definitely take over you cultures are rotifers

Isocrysis is harder to start and keep viable after storage (so I hear). I've found it does not react the way green phytos do but other than that I think it is the easiest stuff I have.
If you are using it to grow out larvae, I suggest buying Nanno concentrate and grow the Tetraselmis and Isocrysis (for experience) because Nanno is the main ingredient and Tetraselmis and Isocrysis have different nutritional values and contributions so I think they are important.
You may have to email me: stukatim It's a yahoo account (I don't put it all together here so the 'web spiders' don't start sending me more junk mail.
Sorry if this is TMI or an 'over-share'.
LMK, Tim