Back in July 2022 I wrote about Mullvad VPN offering 12- and 6-month activation code cards on Amazon (see Mullvad news release). I had my Mullvad account set to auto-renew back then. Last October, I decided to use the Amazon card option for the first time. I just activated my third Mullvad renewal card, this one for 12 months instead of 6. The cards work well and are now my preferred method of re-upping my Mullvad account (at least until I stockpile Monero or something).