3M TEKK WorkTunes Hearing Protector ($28.80 USD + Shipping) after Coupon @ Amazon

3M TEKK WorkTunes Hearing Protector, MP3 Compatible with AM/FM Tuner
The coupon that reduces the price by 20% didn't have a coupon code but rather, it was located underneath the price. If you click it, it is automatically applied at the checkout.

All-in-one hearing protection and entertainment. Know your risks. Put safety on your list. That means choosing the right hearing protection before the project begins. 3M WorkTunes Hearing Protector is the ideal choice if you are looking to protect your hearing while enjoying your favorite music or radio station. Designed with innovation and functionality, 3M WorkTunes Hearing Protector features Voice Assist for easier use and Bass Boost technology for enhanced sound quality and performance. Strong construction and durable materials help prevent breakage and better withstand daily use. Perfect for the workshop, job site, or yard, 3M WorkTunes Hearing Protector blends hearing protection and entertainment seamlessly. Makes for a great gift!

Noise Reduction Rating (NRR) 24 dB
Redesigned headband / ear cushions
Voice Assist makes programming and controlling headset easier
Redesigned battery cover – stronger hinge design helps reduce breakage
Softer ear cup padding for extended comfort
Redesigned buttons / knobs for a contemporary design
Soft-touch material on ear cups to help improve grip
2 Bass Boost options control the amount of bass for a customized listening experience
Easy-to-use auto scan helps find available radio stations at the touch or turn of a button
Recessed input jack

Applying clip coupon is done by clicking the Clip Coupon button, underneath the price.

With Amazon Currency Converter, price came down to
AUD 44.20 + AUD 10.17 - AUD 8.84 = AUD 45.53 for Canberra

The cheapest I've found on ebay including shipping was AUD $68.00
With the coupon, it is below the best price according to CamelCamelCamel.