I'd been waiting for a Tidal deal to check them out. This is it! I signed up for individual, but it appears that Hifi Plus Family for 3 months is the same price. New users only.
Terms for Individual plans
Promotional campaign runs until 31.08. for new TIDAL users only. The promotional campaign can only be used once. After the promotional period, you continue to listen for A$11.99 / month for a HiFi subscription or A$23.99 / month for a HiFi Plus subscription.
Terms for Family plans
Promotional campaign runs until 31.08. for new TIDAL users only. The promotional campaign can only be used once. After the promotional period, you continue to listen for A$17.99 / month for a HiFi subscription or A$35.99 / month for a HiFi Plus subscription.
buyer beware. when you cancel free trials / memberships there is a 50% chance that they will just keep charging you, i and many others had this issue (google it and see how many results appear) and they do not have a refund policy, at least the last time i checked, for anyone outside the UK, so they just ignore you. i had to go the paypal dispute route, which they also ignored, so paypal gave me my money back.