Right now Porkbun has the cheapest first year at $257.98, and Porkbun the cheapest renewal at $2,060.25. Over three years the lowest total at one registrar is $4,378.48 at Porkbun.
Why does .inc cost more after the first year?
Many registrars sell the first year below cost and recover it at renewal: at Porkbun, .inc renews at $2,060.25 after a $257.98 first year. Compare the renewal and 3-year columns before you buy.