Right now internet.bs has the cheapest first year at $27.24, and Porkbun the cheapest renewal at $412.46. Over three years the lowest total at one registrar is $1,237.38 at Porkbun.
Why does .new cost more after the first year?
Many registrars sell the first year below cost and recover it at renewal: at internet.bs, .new renews at $782.00 after a $27.24 first year. Compare the renewal and 3-year columns before you buy.