On their basic platform at schwab.com
You click on <Trade>, and then click <Bonds>. On the page it takes you to, you then have to click on another link that says <Find Bonds & Fixed Income>.
Then you can do a search, and there is a drop down with various types of bonds, e.g., corporates, treasuries, and agencies.
It's a bit clunky. I don't see a way to limit the search to a particular agency. But there are lots of other variables you can control, such as maturity and yield. And once you get results, you can click on the column header to order the results alphabetically, which will organize them by the name of the agency.
