Looks like CNBC is reading my post here...
Also, you can each buy $10K this month, then in January buy another $10K each. And if you have a business, that business can also buy up to $10K a year:
......."Another downside of I bonds is the annual purchase limits. Individuals generally can’t buy more than $10,000 in electronic assets per calendar year.
However, with the year-end approaching, an individual may buy $20,000 by purchasing $10,000 by Dec. 31, 2021, and another $10,000 on Jan. 1, 2022, or later."
This is exactly what I am doing.
https://www.cnbc.com/2021/12/10/couples-can-fight-inflation-with-7point12percent-risk-free-interest-on-40000-.html