So this post is for the 20% off promo code but also to highlight the Clearly price beat guarantee.
I actually found my order cheaper (YMMV) using the Specsavers current promo https://www.ozbargain.com.au/node/335665 and Clearly took a further 5% off the Specsavers discounted price.
They have price beat any online price for me in the past - even dodgy looking sites.
The shipping is free and next day delivery and they also cover the shipping if you need to return anything - they just send you a shipping label to print out and your good to go.
Also able to claim back from your health fund if you have one.
The other bonus with clearly is that if you find a cheaper price anytime within 30 days of your order they refund you the difference. So if Specsavers (or any retailer) have a better deal in a months time just email or call them for the refund. Pricebeat only applies to contacts though not glasses.
I had a bad experience trying to price match with clearly. The first time they did it without issues. The second time for the same website they just chose to ignore my message. This was early last year. Havent shopped with them since