Right now Porkbun has the cheapest first year at $8.24, and Sav the cheapest renewal at $25.14. Over three years the lowest total at one registrar is $60.27 at Sav.
Why does .broker cost more after the first year?
Many registrars sell the first year below cost and recover it at renewal: at Porkbun, .broker renews at $32.44 after a $8.24 first year. Compare the renewal and 3-year columns before you buy.