When I bought brokered CDs at Fidelity two weeks ago it was a snap. I haven't checked the process or interface at TD Ameritade... or did you mean TD as TreasuryDirect? I was surprised by undisclosed fees buying municipal bonds through Fido a few years ago so I've been loath to try again with any fixed income products. Treasury Direct isn't that hard to manage money through. I mention the antiquated UX more as a prop horse that's fun to whack every time I pass by than as a real problem. I've got to use the site for I-bonds anyway, so buying T-bills elsewhere doesn't let me reduce the number of accounts I have to manage. But I'll take a look at how T-bills are sold through brokers to determine if it's worth buying T-bills there in the future.