Via their online magazine (no listed expiry date, but I just used it so it's working today): https://www.blinkist.com/magazine/posts/blinkist-discount
Not as good as previous deals but not bad for a whole year! Subscribed via Indian VPN using my Aussie ING card and the cost came to exactly $17.
Make sure to cancel the subscription immediately afterward so it doesn't auto renew in a year when you've run out of steam on your New Year's resolutions and forgotten the app exists.
Good deal if you missed their end of year 90% off sale though I didn’t end up using it much