Right now Dynadot has the cheapest first year at $1.39, and Alibaba Cloud the cheapest renewal at $9.90. Over three years the lowest total at one registrar is $22.30 at Alibaba Cloud.
Why does .cyou cost more after the first year?
Many registrars sell the first year below cost and recover it at renewal: at Dynadot, .cyou renews at $10.99 after a $1.39 first year. Compare the renewal and 3-year columns before you buy.