In elementary school (1960s), we used to participate in the savings bond program by buying 10-cent or 25-cent stamps that went into a booklet. When the booklet was filled, it was redeemed for a saving bond.

As noted earlier, the Treasury did not inform people when their bonds matured. It still doesn't, as far as I know.

Banks are getting out of the savings bond business, but you can still purchase them from the Treasury. You can also have part of your income tax refund set aside for bonds, as a form of direct deposit.