Not sure how many hipsters frequent OZBargain, but 20% off the sale prices is a pretty good deal. (Free international delivery always on ASOS).
Also, change prices to £GBP (in the top right hand corner) and then let Paypal, or whatever service you're using to pay with, convert it to AUD to save that extra little bit (probably around 5-7%).
Copied and pasted their t&c's from the email:
*Enter promo code YES20 at checkout to receive 20% extra off sale items. Valid from 16:00 AEST on 08.04.2014 until 17:00 AEST on 14.04.2014. Valid for one transaction only per customer up to a maximum of $950 before discount is applied. Offer cannot be used in conjunction with any other promotional codes. Some exclusions may apply, not valid on gift vouchers, optional delivery charges, ASOS Marketplace or ASOS premier subscriptions.
or pay with your 28deg card in pound