Email ProtonMail Pro Black Friday up to 50% discount on custom @domain Email

My fav bargin site listed ProtonMail paid plans have up to 50% off discount right now ProtonMail Black Friday Sale - Up to 50% off ($72 USD / ~$106 AUD for 2 Year Plus Plan). Sweet spot is Plus plan for 2yrs for US$72 for 2yrs or US$36/yr which is 40% savings and seems from 3rd year renewals at 33% discount of US$79 every 2yrs or US$39.50/yr.

From ProtonMail - Black Friday

Plus Plan
for 1 year
$3.33 /mo
Billed as $39.99 (1)
Standard price:
$60

Plus Plan
for 2 years
$3 /mo
Billed as $72 (2)
Standard price:
$120

ProtonMail + ProtonVPN bundle for 2 years
$7.50 /mo
Billed as $180 (3)
Standard price:
$360

Offer valid only for first-time paid subscriptions

(1) Renews after 1 year at a discounted annual price of $48 per year (20% discount)
(2) Renews after 2 years at a discounted 2-year price of $79 every 2 years (33% discount)
(3) Renews after 2 years at a discounted 2-year & bundle price of $190.40 every 2 years (47% discount)

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Existing ProtonMail users also get discounts ProtonMail Black Friday Sale 2019: Save up to 50% - ProtonMail Blog

 

And