two cents
two cents {n.} {informal}
1. Something not important or very small; almost nothing.
Paul was so angry that he said for two cents he would quit the team.
When John saw that the girl he was scolding was lame, he felt like two cents.
2. or two cents worth
Something you want to say; opinion. — Used with a possessive.
The boys were talking about baseball, and Harry put in his two cents worth, even though he didn't know much about baseball.
If we want your two cents, we'll ask for it.
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Source: A Dictionary of American Idioms