This is not an idiom because it means just what it says. If something is a bargain, then it is always a bargain. It doesn't matter what the circumstances are.
The plural of bargain is bargains.
Yes, the word bargain can be used as a verb.For example: "We will bargain with them".Other verbs are bargains, bargaining and bargained.
She loved to find bargains.The Bargains Galore store held a sale.Looking for a coat, I found a good bargain.
an idiomatic expression
idiomatic expression
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"Turn a deaf ear" is an idiomatic expression meaning to ignore or pay no attention to something.
The idiomatic expression "a steal" refers to an item or deal that is perceived as being very inexpensive or a great bargain, often significantly lower in price than its perceived value. For example, if someone buys a high-quality item for a fraction of its usual cost, they might say they "got it for a steal." The phrase indicates that the buyer received exceptional value for their money.
Bargains regard seemingly advantageous offers of sale and commerce. Similar terms to bargains are steals and deals, both terms having positive connotations.
Idiomatic expression
humbly
"You" is not an idiom. It is a pronoun.