Be ten a penny British informal
In America, people use "be a dime a dozen" instead of "be ten a penny". In Britain, "be two a penny" is a variant of "be ten a penny".
If someone or something is ten penny, it is very common, easy to get, or cheap.
I'm fed up with this kind of sentimental movie. It has become ten a penny.
Couples dressing alike are ten a penny these days.
Self-help books have been ten a penny recently on the shelves of most bookstores.
The verb "be" should be conjugated according to its tense.