Discounted to $29 and can claim $20 cashback from Trend Micro here bringing the total to $9 + $6.95 shipping.
Title includes shipping cost ($6.95) which is removed if purchasing more than $45 in one transaction.
Cheapest alternative I can find is 2 devices for $59 at JB HiFi
This requires a club catch membership, which is $6.50 per month if you don't have it already making this $22.45, still far better than JB's price.
Cashback claim details from catch website:
"$20 cash back promotional period is for purchases made from 03/05/18 – 31/07/18. Claims must be made within 30 days of purchase date as per the claimant’s proof of purchase.
Your claim must be submitted online at: www.cashback.trendmicro.com.au"
![Trend Micro Maximum Security 2018 (3-Device, 12-Month) [Digital Download] $16 (after $20 Cashback) @ Catch (Club Membership Req)](https://files.ozbargain.com.au/n/66/377266.jpg?h=e438a835)

That's a very confusing title. I would put the fact that a cashback redemption is needed to get it at $9 in the title.
Edit: Nevermind; it's since been edited.