No, that is the only place you can buy the best enrichment product.
The next best thing would probably be High DHA Selco, but most places don't carry that type of Selco and the other Selcos just don't have enough of the DHA to do the job, IMO.
Also, the Selcos don't have the probiotics and vitamins in it that Dans Feed has.
Some people think they are enriching their bbs with nannochloropsis but bbs don't digest this well and nanno is not a balanced nutrition anyway.
Also, it doesn't have the needed DHA properties so you would have to also use Isocrysis for proper nutrition. The Iso would have to be about 10 times or more than the volume of nanno due to the lower density of the culture.
It is not impossible to keep the dwarfs without enrichment, just that their already short lifespan will not be what it can with proper enrichment.