This deal is back (if it ever went away - marked as expired here but works).
$10 off any plan for the first 6 months.
Just signed up due to AussieBroadband price increases.
The Superloop NBN WhistleOut Exclusive Offer gives new residential customers sourced via WhistleOut $10 off any Superloop NBN Plan for the first 6 months (Offer), subject to these terms and conditions.
This Offer is open from 24 July 2020 until midnight AEDST 30 September 2020. Superloop may withdraw the Offer
at any time without notice. By applying for the Offer, you agree to be bound by Superloop’s Standard Form of Agreement (SFOA) and these Terms and Conditions. Superloop may change these Terms and Conditions at any time in accordance with the SFOA
Update: Using the referral link gets the same deal, but also benefits a fellow OzBargainer! Win-win!