How much is a 1979 dollar coin worth now?

Unfortunately only one of the of the Susan B. Anthony dollars made for general circulation is worth more than face value. The 1979 "P" Wide rim (near date) variety. Other than that, only Proof and collectors coins sold from the US Mint are worth more. None of the coins have been made from silver, if it's not one of the Wide Rim type, just spend it.