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Cloudflare, but you can’t register with them, only transfer in. I buy at Namecheap, and then transfer in.

Edit: Based on Austin’s below reply it looks like you can register directly with Cloudflare now. Thanks Austin!

You actually can register with them and they promise to provide registration at cost forever: https://www.cloudflare.com/products/registrar/

Note: They released the beta fairly recently, which is why a lot of folks don’t know about it yet.