Saw this come in and seemed like a good price factoring in cashback via shopback
Originally $107.55 USD (or $2.99/month) but with 56% shopback from Shopback comes up to $47.32 USD (~$67 AUD) or $1.31/month USD (~$1.85 AUD)
NEW CUSTOMERS ONLY. If you signed up within 30 days you could probably cancel and sign up under a different email.
See some historic prices - https://www.ozbargain.com.au/search/node/nordvpn
Edit: I'm unsure if the coupon code affects cashback in any way but since it's on the shopback site I would recommend you use it so there's no questioning it.
Edit2: Updated expiry as the NordVPN price seems unchanged. I think cashback runs till 12th