I don't qualify for membership, and that rate is only good for a max of $3,000, so wouldn't be very useful for me anyway.
I've often seen Navy Federal in the top tier on DepositAccounts in the past, but since I don't qualify for membership, I've ignored it. Currently their CD rates are not top tier, but they are listed on DepositAccounts, as usual.
The bottom line for me is that Ken at DepositAccounts does this full time, and there are lots of folks on that site that contribute info about CD deals. Perhaps I could find better deals if I spent lots of time looking, but that's not how I want to spend my time.
A fellow Boglehead did once PM me about a good local CU CD deal, and gave me a tip on how to qualify. Unfortunately, by the time I got on it, the rate had dropped significantly, but it still was a good deal, and I pursued it. What I learned from that is that if you want to work at it a bit, it can be profitable to scan the local CU deals (not nationally available), and look for ways to qualify. But it is more work, and I just prefer to wait for the good national deals to come along.