Domain retail is a subscription business disguised as a purchase. The first year is the customer-acquisition budget; every year after that is the margin. That is why a .com can be advertised at A$4.95 and renew at A$39.95, and why the only price on this page that matters is the renewal column. If you register a domain you intend to keep, the first-year price is noise.
Three registrars are worth defaulting to. Cloudflare Registrar charges the registry fee plus the ICANN transaction fee and nothing else — there is no markup and there never has been, because domains exist to pull you onto Cloudflare's DNS. The catch is that it only registers domains you already have on a Cloudflare zone, it sells a narrow TLD list, no .au, and support is a ticket queue. Porkbun is the better general-purpose choice: near-cost pricing, free WHOIS privacy, free email forwarding, free SSL, one-click DNSSEC, and an auth code sitting in the dashboard the moment you unlock. NameSilo is the one to use when you hold hundreds of domains and care more about bulk tooling and flat renewals than about the interface.
The expensive end is expensive for a reason. GoDaddy and Crazy Domains run the same playbook — loss-leader first year, aggressive checkout upsells, paid add-ons for things competitors give away (DNSSEC behind Premium DNS at GoDaddy, free email forwarding withdrawn in 2022), and an exit path that routes through retention offers. Squarespace Domains inherited the Google Domains book at a flat twenty dollars and has been quietly the least annoying of the expensive registrars, but you are paying roughly double Cloudflare for a nicer control panel. Gandi used to be the principled European choice and repriced itself out of that role in 2023; it is now a specialist pick for TLD breadth and registry lock, not a value one.
For .au the calculus is different and mostly not about price. auDA-accredited registrars — VentraIP, Synergy Wholesale, Crazy Domains, GoDaddy — differ by an amount of money that will not change your life, and differ enormously in whether a human answers when a .com.au transfer stalls. VentraIP and Synergy Wholesale both run Australian support desks that understand the auDA transfer rules; the international registrars that resell .au generally do not. WHOIS privacy is irrelevant here: auDA already redacts registrant contact data, so a registrar charging you for .au privacy is charging you for nothing.
The direction of travel is consolidation. Verisign takes its permitted .com increase in most years and every registrar passes it through, which slowly compresses the gap between the cheap and expensive tiers in percentage terms while widening it in dollars. Meanwhile the interesting registrars are becoming front ends for something else — Cloudflare wants your DNS, Squarespace wants your site, Spaceship wants Namecheap's next decade of customers. Pick the one whose real business you are happy to be adjacent to.