The phrase 'Dime a Dozen' is used to describe something that is common and easy to obtain.
Example of Use: "Guys like that are a dime a dozen."
There is no record of the origin of the term 'dime a dozen' but scholars agree that the term was coined sometime before 1930, when it first appeared in print. It is believed that it originated sometime during the 1800s, when 'dime' was first used as slang for the number ten and when a 'dime' of every twelve (dozen) hens’ eggs were likely to hatch.