Right now Porkbun has the cheapest first year at $52.01, and Sav the cheapest renewal at $88.58. Over three years the lowest total at one registrar is $248.71 at Porkbun.
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Many registrars sell the first year below cost and recover it at renewal: at Porkbun, .adult renews at $98.35 after a $52.01 first year. Compare the renewal and 3-year columns before you buy.
How long can I register .adult for?
1 - 10 Years. Paying for several years at once protects you from price rises.