Proton Mail Plus €23.88 (~A$39.27, 60% off) for 12 Months + More @ Proton

Other Black Friday Deals:

VPN Plus 24 months €71.76/~A$118.01, 70% off https://protonvpn.com/l/bf-vpn-deals#pricing
VPN Plus 12 months €59.88/~A$98.47, 50% off https://protonvpn.com/l/bf-vpn-deals#pricing

Drive Plus 12 months, €23.88 /~A$39.27, 60% off https://proton.me/l/bf-drive-deals

Pass Family 24 months, €41.88 /~A$68.87, 50% off https://proton.me/l/bf-pass-deals#pricing

Unlimited 12 months, €77.88 /~A$128.08, 50% off https://proton.me/l/bf-pass-deals#pricing

As pointed out by @Halsmich, it is likely slightly cheaper if you opt to pay in USD.