A dime a dozen means regular, boring, common, worthless thing that are common and easy to get.
1) Rude people in New York City are a dime a dozen. Everywhere you go, there
are rude people.
2) I don't need friends like him; they are a dime a dozen.
3) We don't want to be hurry to get a thing which is a dime a dozen because it is
not so special and you could get one any time you wanted.
4) English teachers in Korea are a dime a dozen. There are so many English