IRIOST has a collection of different strains of microorganisms. Their features are described for each strain. You can the official page of this organization.
Bdellovibrio and like organisms (BALOs) as a probiotic/biological agent to controlpathogens or potential pathogens. You can collect from pond or sea water, soil , animal gut or plants.
To know more you can read this chapter or whole book :
Chapter Antibacterial Activities of Bdellovibrio and like Organisms ...
DOI:10.1007/978-3-030-45599-6_4
In book: The Ecology of Predation at the Microscale
As said earlier by scientists ATCC and many organizations are selling commercially. Even you can get strains from CHR Hansen, Sacco , Danisco etc., sell DVS cultures.
Hello - You can isolate probiotic bacteria from probiotic medicinal products or fermentation products. Or get them from the center of industrial microorganisms in Iran- http://irost.org/ptcc/