US Treasury Cash Management Bills

[scfr]

I see that the US Treasury will be auctioning 10-day Cash Management Bills on June 4th and I'm interested. However, per US Treasury rules I cannot purchase it through my Treasury Direct account. I have to go through a bank, broker, or dealer.

Anyone ever purchase a US Treasury Cash Management Bill before?
If so, how did you buy it? Did you pay a commission? How was your experience? TIA!

[JBinKC]

Unless you are dealing with some big amounts of cash I would think the commission would take away most of your interest return.

What I would do with my short term cash management is stagger 28 day bills and those you can do at the convenience of your computer at home commission free in amounts as low as a discounted $1,000 increment.