Normally bacterial strains can be purchased in specialized centers Reference for example in my country Venezuela bought in the Venezuelan Center for Collection of Microorganisms, In the US also are reference strains ATCC (American Type Culture Collecction). Surely in your country must be some center.

Yes Ms. Gil , thank you very much. But I find this bacteria in here not yet

Christa, I did browse for you, and I get the information that you can get this basillus mucilaginosus from fertilizer shops or suppliers. I am not sure whether you can get it from your home city Malang. But probably you can ask them to make it available for you. Wish the best.

Yes sir. Thank you very much Mr. Rudi