At midnight eastern,(12:01) just look at the "Starting Today" page. There will be a long list of items ready to be bid on immediately. Then as you scroll down the page, the table turns yellow, which shows the times which other stuff will come on line.
As far as I can tell, there is no way to get a preview of what comes on at 12:01am for immediate bid.....................it's the way cbid gives us a daily surprise..