I have several silver certificate dollar bills. What are they worth?

The majority have a trade in value 10 cents above the face value, so can probably sell them for $1.10. They typically sell at retail for about $1.50.

Uncirculated silver certificates have much higher values, typically around $2. As is always the case, the year and issue details matter. Specific dates and versions, like a 1928 "E," can have dramatically higher values.