I don’t know what’s near you, nor do I know what type of school environment you’re in.
I have always worked in smaller schools (where the majority of the students are at or below the poverty line) and teacher clothing is pretty casual. As a student teacher, I was told to dress professionally on the first day, take a look at what everyone else wears, and then to dress one step above everyone else.
You can usually find some nice professional clothing at thrift stores. A lot of people donate items that have never or have barely been worn. You can also ask the teachers you work with for what good stores are near you.
