1.cheap at twice the price 形容某個東西很便宜！！
Remarkably or exceedingly inexpensive (as in, even if you doubled the price, it would still be a good value).
好便宜！就算這個價格乘以二，也還是很便宜！白撿一樣！
I got a brand new suit for 50 bucks—cheap at twice the price!
我買了個西裝才50刀？太便宜了吧！

2.cheap Charlie 小氣鬼！
A derogatory term for a miserly or parsimonious person. Used largely in countries of Southeast Asia, it likely originated in Vietnam during the Vietnam War to refer to American GIs (who called soldiers of the Viet Cong "Charlie") unwilling to spend extravagantly at bars, restaurants, or for prostitute.（用英語來解釋英文）
Buy us a round of drinks, don't be a cheap Charlie!
誒誒誒請我們喝酒啊！別當小氣鬼咯！

3.dirt cheap 很便宜！這里的dirt相當于super，超級便宜的意思。是一個年輕人比較愛用的表達。
I found the shoes yesterday, they were dirt cheap, i had to buy them.
我昨天看上幾雙鞋，我的媽呀好便宜！不買不行！不買對不住自己！

4.一元店：Dollar Tree（美式）, Poundland（英式）

5.cheap shot 惡意中傷，不公正的批評。也就是“黑”某人A mean or unfair criticism.
I didn't appreciate that cheap shot you took at me at the party. You made me look foolish in front of our friends.
你昨晚在爬梯上那樣黑我我真的很不爽，真的是讓我在一群朋友面前出丑！
Sunny: Ambert always uses hermes body wash!
安姆博特老是用愛馬仕的沐浴露誒！
Jack: Why'd you always make fun of him about this ! cheap shot!
你這么老這么黑他！真的要不得！
（此處Sunny要給安姆博特說對不起，NO OFFENSE）

6.all over someone like a cheap suit 形容某人很粘人，掛人身上不下來那種。
pawing and clinging; seductive. (A cheap suit might cling to its wearer.)
She must have liked him. She was all over him like a cheap suit.
她一定很喜歡他吧，總是掛在他身上像個cheap suit