Most of the journal offers ZERO article processing charge (i.e free submission and publication), unless you opt for an open access. You can look for journals from publishers like Elsevier, Springer, T&F... etc. Good Luck.

I suggest you sent your manuscript for  Journal of microbiology, Biotechnology and food science 

"Microbiology" or "Research in Microbiology", both good quality free publishing journals

JOURNAL OF MEDICAL MICROBIOLOGY (JMM), a journal of the Society for General Microbiology (SGM), is one of the leading peer-reviewed journals in the field, providing comprehensive coverage of medical, dental and veterinary microbiology and infectious diseases, including bacteriology, virology, mycology and parasitology. JMM currently has an impact factor of 2.266 (2013).

You can try Applied Microbiology and Biotechnology

Indian Journal of Microbiology

ETC

You can try Emirates Journal of Food and Agriculture

You can try ''Letters in Applied Microbiology''.

JMRI all the way bro.

http://www.jmri.org.in

You can try to Polish Journal of Microbiology.

You can send the paper in American journal of biomedical sciences or Journal of biomedical sciences