If you are near a Costco, go there. The membership is $60 p.a. Costco has full service audiology departments and their service has been tops.
My hearing aides were about 1/3 the price that local independent audiologists demanded. They have a good range although not the top of the top of the state of the art but just below it (eg last years top model), down to fairly basic. A pair of high end BTE devices will be around $AUD2-3,000, product dependent.
