I used to have a treasury Direct account. Buy what ever. Now do all that at Schwab. The software loads $25K into the default amount. I always keep a $100K in T-Bills. A "chill pill" for the compliance officer.
A round lot for most bonds (Munis, corporates) is $100K. Treasuries is a $Million. But the spreads at Schwab look pretty tight. I've sold Treasuries to the desk at Ameritrade. Works fine. Tons better than selling a CD back. You will get killed doing that.
Many TA people can find a H&S bottom in here. That must be respected even if it doesn't work out. The stock perma-bulls are deranged, lacking discipline. .