10PCT
When browsing Jaycar's website, I encountered a window that says "join now for 10% your next online order". Turns out you just need to "join" their email subscription list. You can put any email address in there. No checks whatsoever. The window then displays a coupon code 10PCT.
Unknown start and end date.
Minimum spend $50, excludes gift cards.
I tried it on an order and saved a sweet $12. Enjoy!