Visit website, wait a second or two and a pop up will appear asking for your phone number. You will then get a SMS with code.
I just bought some accessories from here yesterday for some new devices I got. Signed up with my email for their 10% off for new customers, then today I needed something I forgot and noticed 20% off if you enter your phone number. Placed order and it worked OK so existing customers may be able to use it. My orders were only about 15hrs apart so it's possible it worked for me as I wasn't in the system yet.
I have their screen protectors on all my devices and a windscreen mount holder, highly recommended. I just got some of their kevlar USB cable, nylon braided rated to 100W. A little pricey but they make quality products and 20% off helped. They are also an Australian company.