I wish I could, I don’t have that much money! ;)
Treasury has lowered the minimum purchase amounts for its’ TreasuryDirect online accounts that anyone can open. The paper savings bonds accumulated can be converted to online ledger accounts even.
Still, there is a huge demographic that doesn’t know anything about computers and probably will never care to learn. Those I-bonds were a pretty good deal (at times) for those who wanted to park a nice chunk of money in a safe spot, and have favorable tax advantages. They aren’t a marketable security though.