[tanderson92]

One thing that is not discussed is that one can participate in U.S. Treasury auctions at brokerages (as well as TreasuryDirect but I sympathize with those who would want to avoid that site). Fidelity and Schwab both promise retail investors the so-called "high rate", with no bid/ask spread on new treasury auctions. There are no markups or fees. Furthermore, at Fidelity one can manually roll over treasuries into new auctions and at Schwab it is not much harder but is done manually a day or two before the auction.

Bid/ask spreads are an annoying feature of OTC bond markets since bonds are not currently traded on exchanges (hello SEC! Please fix this) for retail customers since they don't have the volume to obtain the tightest spreads. So, one can just avoid spreads entirely by only participating in auctions, at least while building/maintaining a ladder.