Typical ielts pay

Does anybody know what the pay for a weekly ielts class should be? Lets suppose its not the actualy IELTS centre, but rather simply a school that runs a class professing to help people pass the test (rather than pressing them just to study more, offers them solutions that they should know any how.)
ps in Taichung

I’ve seen 700-1300, depending on all sorts of factors such as whether you are an examiner, from UK/Aus/NZ, speak chinese, they are desperate, and class size.