Depending on the year, the value of the alloy in one 5 cent coin may be worth as much as $1.71. Current nickle coins Don't have much nickle in them and are actually worth only about .8 of face value.
Pennies, depending on the year and therefore the actually copper content, may be worth nearly double face value.
NOTE: I refer only to the value of the actual metal in the coin. This ignores any collector value, that even debased coins may have.
ref: http://coinapps.com/copper/penny/calculator/