Right now Porkbun has the cheapest first year at $1.80, and NameSilo the cheapest renewal at $10.95. Over three years the lowest total at one registrar is $23.89 at NameSilo.
Why does .bond cost more after the first year?
Many registrars sell the first year below cost and recover it at renewal: at Porkbun, .bond renews at $15.96 after a $1.80 first year. Compare the renewal and 3-year columns before you buy.