When you want to express that something is not worth your time or effort, there are several synonyms you can use for the phrase "something isn't worth a plug/wooden nickel". Some examples include "it's not worth a dime", "it's not worth a penny", "it's not worth a fig", or "it's not worth a damn". These phrases convey the same meaning, that whatever is being referred to is not worth any amount of money or effort. By using these alternate phrases, you can add variety to your language while still getting your point across effectively.