There are several ways to get a Cosette AU coupon code. One way is to check their official website for any ongoing promotions or deals. Another way is to sign up for their newsletter, as they often send special offers and coupon codes to their subscribers. Additionally, there are various online platforms that provide Cosette AU coupon codes. For instance, there are codes like BIANCA100 for 10% off sitewide, and a code for $150 off your purchase. Please note that these codes are subject to terms and conditions and may expire after a certain period. Always make sure to check the validity of the coupon code before using it.