Region: US | Usage example: Those tutorial videos are a dime a dozen, so you can choose carefully.

A dime a dozen

Meaning

Very common and of little value.

Used when something is plentiful and not special.

Origin notes can vary by region and source; this page gives the commonly reported explanation and usage context.

Refers to the low price of a dime-per-dozen goods sold on streets.

Recorded in early 20th-century American marketplaces describing cheap items.