"Dermeren.com.au" offers a variety of active coupon codes. Some of the notable ones include a Summer Sale where customers can get $25 off sale items. There's also a code for a further $25 off sale items. Customers can get 20% off their order with a specific code, and another code offers 35% off the order. There's a 30% discount on all devices, and customers who sign up for the newsletter get 15% off their first order. There are also expired offers that may still work, including a Boxing Day Sale with 30% off sitewide, a Black Friday Sale with 50% off sitewide, and a 40% off flash sale. The End of Financial Year (EOFY) Sale offered 30% off storewide. Please note that these offers and codes are subject to terms and conditions of the website.