Downgrading Subscription

I have a subscription for 10 devices, 99 per year. Can I get a less expensive one? We don’t use all 10.I can’t find that anywhere.

Some resellers may sell fewer devices version (Amazon store sold 7 devices for Japan before); official store only sells 1 or 10 device(s) afaik.
Also, you may get discount from in-app advertisements or after-trial coupons.