Recs.
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Porkbun is a U.S. based domain name registrar that has one guiding principle: operate on the thinnest profit margin possible, without gimmicks or loss-leading sales, and give the customer the lowest price for their domain name along with industry-standard basic features.
SpecsUpdate
Pros
Pro Sincere, personal touch to all interactions
The support team is very pleasant to deal with and small enough that personal relationships can easily be formed. The promise of responses to support requests in under an hour is almost universally observed and even their site has some fun (who doesn't like pictures of playful piglets while their SSL certificates are generated?) instilled in it.
Pro Not spamming you with useless offers
They are sincere, they do not spam your inbox with "offers" and services you are never going to use and then, if you make the mistake to accept, pay inflated prices when you renew. They communicate with you only for serious and legitimate reasons. Excellent services!
Pro Free DNS hosting
Registering the domain is only half the battle, the other half is announcing to the world the IP address of the server hosting your site. Porkbun includes this service with all domain registrations and makes it easy to manage by using the GoDaddy DomainConnect standard for service auto-discovery. This means you don't need to get your hands dirty, just pick the web host you want to connect the domain to from the drop-down menu and click OK. Or you can manage all the settings yourself from the control panel without restriction or interference. You can have as many A, AAAA, CNAME, MX, NS and TXT resource records as your heart desires (or ARIN allows).
Pro Transparent, everyday pricing for all domains and services
All the top-level domains available at Porkbun (319 of the 1,562 currently in existence) are offered for $1 above the wholesale price, plus the processing fee for your credit card. No gimmicks or bait-and-switch pricing, no surprises. That's the price for renewal and inbound transfers too, so you know exactly how much you'll be spending every year you own the domain.