a dime a dozen

Related to a dime a dozen: A penny saved is a penny earned, a drop in the bucket

a dime a dozen

Ubiquitous; so abundant or common as to hold little or no value. In Los Angeles, waiters trying to become famous actors are a dime a dozen. That bird might be a rare sight where you come from, but around here they're a dime a dozen.
See also: dime, dozen
Farlex Dictionary of Idioms.

(a) dime a dozen

Fig. abundant; cheap and common. People who can write good books are not a dime a dozen. Romantic movies are a dime a dozen.
See also: dime, dozen
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.

dime a dozen

So plentiful as to be valueless. For example, Don't bother to buy one of these-they're a dime a dozen. The dime was declared the American ten-cent coin in 1786 by the Continental Congress. [First half of 1900s]
See also: dime, dozen
The American Heritage® Dictionary of Idioms by Christine Ammer.

a dime a dozen

AMERICAN
If things or people are a dime a dozen, there are a lot of them, and so they are not especially valuable or interesting. Note: A dime is an American coin worth ten cents. Writers are a dime a dozen, a new one will be easy enough to find. Films about primitive people are a dime a dozen right now. Note: The usual British expression is two a penny.
See also: dime, dozen
Collins COBUILD Idioms Dictionary, 3rd ed.

a dime a dozen

very common and of no particular value. US informal
A dime is a small US coin worth ten cents which occurs in various US expressions as a metaphor for cheapness or smallness.
1998 New Scientist Of course, medical breakthroughs are not a dime a dozen.
See also: dime, dozen
Farlex Partner Idioms Dictionary

a dime a dozen

Overly abundant; commonplace.
See also: dime, dozen
American Heritage® Dictionary of the English Language, Fifth Edition.
See also:
  • dime a dozen
  • be a dime a dozen
  • dime
  • dozen
  • dime store
  • dime piece
  • do bird
  • flip (one) the bird
  • yankee dime
  • abound