Today’s idiom: a dime a dozen
Meaning: common, not valuable
Origin: There was surprisingly little about this phrase. What could be found agreed that the phrase came about after the first minting of the dime in the 1790’s. The literal phrase seems to have originated in the mid 1800’s when food was sold for “a dime a dozen.” The figurative use of the phrase likely came about in the early 1900’s.
Told you there was very little found.