Domcomp - No-nonsense domain price comparisons, updated daily
TLD List - Compare Prices of All Top-Level Domains
PorkBun - Porkbun is an amazingly awesome ICANN accredited domain name registrar based out of Portland, OR. We're different, we're easy, and we're affordable. Use us, you won't be sorry. If you don't use us we'll be sad, but we'll still love you.
Domnest - Compare Domain, Hosting, and SSL Prices in one place. Use different price comparison tools to compare and find the cheapest service provider for your website
Domainprice.ME - Price comparison with multiple registrant choices
NameSilo - Domain registration. That's it! And that's what makes it special.