The Gold Coast is a great place to study English, with excellent institutions and a beautiful climate. While price is important, make sure you find a course that meets your needs and is aimed at the right level. Careers Australia has several courses, starting at Preliminary Spoken and Written English, which is nationally recognised and covers basic reading, writing and spoken English skills.
The Gold Coast Institute of TAFE has a similar course, which can be studied online in your own time. If you are at a more advanced stage, Lyceum English Language Australia offers Intermediate and Advanced courses.