Know the I bond rules before you buy
Added
I bond rates reset every 6 months with inflation. You can't cash one in for 12 months, and cashing in before 5 years costs 3 months of interest.
The result
Result: TreasuryDirect: $25 minimum, electronic only, up to $10,000 per Social Security Number per calendar year. Earnings are subject to federal income tax but not state or local income tax.
Note: Not financial advice. General information only; check your own situation or ask a qualified professional.
Source
TreasuryDirect: I bonds (opens the original source in a new tab). Check it for the latest numbers before you act.