Came across this post from Reddit and I thought it is fantastic to share here. This is for Tidal Hifi plan which normally cost $23.99/month in Australia.
Full credit to Benzz1725
" Voucher code https://offer.tidal.com/voucher?code=WL25BAEN6X Must be from the usa to use this code, just use a vpn if you not from here.
Use your card you wont get charged until the trail ends, or you can use this bin 40606840xxxxxxxx and generate the cards via the website namso gen, zip code 10080"
I used free Hola VPN and a fake credit card generated as per instruction above. Work perfectly.