I believe Tbills are still a viable option. Easy to buy at all the big brokers. You can do the weekly auctions or buy on the secondary market. Maturities are 4 week to 52 weeks. If your state has an income tax, you avoid it as well (for both I Bonds and Tbills and other Treasury issues). May be interesting to see how the "debt limit and possible default" plays out in the next few weeks.