Amazon is still offering Kindle Unlimited memberships at up to 40% off through their page for gifting Kindle Unlimited memberships.
Available options include:
2 Years: $143.80
1 Year: $80:30
6 Months: $47.86
All options are on the same landing page which can be found here:
https://www.amazon.com/kindle-dbs…igitalgif
I was able to send myself a gift membership with no issues.