i used to culture it and its really not that hard. more frustrating due to crashes than anything else. make sure you always have atleast wo cultures going. you can order a starter culture online for about $20 and grow your own (F2 food about $12). there are plenty of videos on youtube. get it from a reputed source though, if culturing is what you choose to do, and not most of the local shops. that way you can ensure that a clean nannochloropsis culture is what you are actually getting. good luck
but if you do find some, id too like to get some and start culturing again...