Subscriptions with a dead man's switch. If you don't signal you want to keep the subscription after a few years, it's automatically cancelled. You can sign up at the same price you left with if it cancels automatically.

Yep, my gym would love to cancel my membership. I also paid in advance: 2 years worth for a special limited-time promo. Now, I can renew yearly for $99. Only catch is, if it ever expires, it can't be joined again. They will pry it from my cold, toned hands!