I'll also soon recheck the prices of listed VPN providers and also update this thread with Black Friday deals. I think that Mullvad and IVPN won't offer discounts but many Non-Privacy Focused Mainstream VPNs will offer good Black Friday deals.
Stay tuned for a news update.
It is very unlikely that IVPN or Mullvad will offer discounts as I am 99 % certain that they never did. Mullvad especially has kept their price - 5 € - the same ever since their inception in 2019.