Not sure -Is there any minority group (ethnic)for the newcomers (mostly housewifes who English aren't their first language) to the country? There is one in my area which they provide a free English course for member (of course it is funded by council but they had to apply for grant and need to have a good number of member).
Anyway good luck to what you choose.
Anyway I notice that recently, most of free course now are no more available. They are now charging everyone but still with affordable fee. If you would like to practise your English, how's about some volunteer work (without pay). This way you will gain some experience working with native local and learning(practise) English at the same time as well as prepare yourself to work in the future (CV).
It sounds like they charge you an oversea-student rate. You're better wait then. How long have you been living here then?