Something very common, cheap and easy to get

Don't bother bringing all those sunscreens with us. We can easily find them on the island and they are a dime a dozen

Non preoccuparti di portarti tutte quelle creme solari, ne troveremo a bizzeffe sull'isola a poco prezzo

Christmas is coming and “panettoni” are a dime a dozen in Italy, but a quality “panettone” is another thing alltogether

Siamo sotto Natale e di panettoni ce n'è quanti ne vuoi dove vuoi. Però il panettone artigianale di qualità è tutta un'altra cosa

Thirty years ago, these watches were the state of the art and were very expensive; today they are a dime a dozen

Trent'anni fa questi orologi erano la grande novità tecnologica ed erano venduti in pochi negozi perché erano molto cari. Oggi li trovi dappertutto a bizzeffe

The dime is the American ten-cent coin (0.10 US$), introduced in 1796. In the 1800s this sentence was used literally (one dozen items for one dime), but since the 1900s the phrase has been used figuratively, meaning something common and cheap