6-month T-bills are currently yielding 2.18%. They're pretty much the most secure investment you can possibly make. Vanguard, Schwab, and Fidelity all charge no

6-month T-bills are currently yielding 2.18%. They're pretty much the most secure investment you can possibly make. Vanguard, Schwab, and Fidelity all charge no commissions on treasuries, whether traded on the secondary market or new issues. Fidelity has the added bonus of having an "auto-roll" feature which will automatically invest maturing bonds into new ones of the same type, making for a completely hands-off investment.