Most silver certificates sell for a little more than the face value. For example, a $1 silver certificate may sell for $1.25 to $1.50 depending on year and condition.
Silver certificates can used as money for the face value printed on the certificate. Collectors may buy a silver certificate for more than the face value. How much a collector would pay depends on several factors, such as condition and date of the silver certificate, if it is a replica, and the design printed on the silver certificate.