Dime a dozen

[Rihanna]

adj: something so common that its value is little or nothing.

[PussyCat]

easy to come by, next to worthless

[Tina]

cheap, easily replaced, not valuable

[Sonia]

An expression used to describe something or someone as generic or easy to find.

[Donald Trump]

Anything that is plentiful with little value. Possibly this phrase originated in the early 1900s as a sale discount for candies that cost a penny.

[Donald Trump]

to be had for next to nothing; common enough to be worthless

[Sarah]

Mr. Rawley, a prestigious educator from Imagine Schools says, In reference to dime meaning 10 and dozen, 12, this phrase can be described as an event or phenomenon occurring 10 out of 12 times.

[Becky]

So cheap you can buy twelve for ten cents.

[Jessica]

Something which is so common it can be picked up with a minimum of funding.

[Tanya Shivari]

cheap, notworth much, easy to come by, not highly valued