Hi, for the last years many journals including microbiological ones, have changed their policy, become open accessed journals and required to pay publication charge. I am not sure that this is good for science. Anyway, there still are many international peer-reviewed journals with open access possibility and without charge, for instance, FEMS Microbiol. Lett. and the other FEMS journals, Current Microbiology, Microbial Ecology, Environmental Microbiology, Archives of Microbiology, J. Applied Microbiology and many others. You may find out more through internet.
If you have access to it, you might want to look at Thomson-Reuters ISI for a full list of journals in the field of microbiology organised according to Impact Factor. Check below for a list of top 10 in previous years as an example:
Most journals allow access at some point - either 6 or 12 months. However, journals published by Springer (generally) are usually pay only. Journals published by and/or for primarily the medical field are also pay only (lancet, jama, etc). Academia is very big on open access as it means information can be shared amongst researchers, a concept that we like very much. So, it sounds like you should go for a more medically related journal.