Right now Sav has the cheapest first year at $7.49, and Hello.co the cheapest renewal at $13.00. Over three years the lowest total at one registrar is $39.00 at Hello.co.
Why does .pet cost more after the first year?
Many registrars sell the first year below cost and recover it at renewal: at Sav, .pet renews at $18.38 after a $7.49 first year. Compare the renewal and 3-year columns before you buy.