How about (100¥)? 賣（一百塊錢）如何？
Don't try to rip me off. I know what this is worth. 別想宰我，我識貨。（ rip sb off 表示“欺騙某人”）
It's too expensive. I can't afford it. 太貴了，我買不起。（關鍵時刻，跟老闆哭窮。）
The price is beyond my budget. 價格超出了我的預算。 （母上大人給的錢太少，不夠花啊！ ）
I’d buy this if it were cheaper. 再便宜一點我就買。
Lower the price, and I’ll consider it. 價錢低一點我纔會考慮。
I’ve seen this cheaper (in) other places. 我在別家有看過更便宜的
If I buy more than one, will you give me a discount?多買一點有折扣嗎？
Could you give me a discount? 能給我個折扣嗎？
Is the price negotiable? 這價錢可以商量嗎？
Can I make an offer? 我能講價嗎？
Can you make it a little cheaper？ 能便宜點嗎?
Let's make it 30 yuan, a round number. 就 30 元了，湊個整吧。
30 yuan is about as high as I can go. 我最高就出 30 元。
I can get a little cheaper at another place. 我能在別的地方買到更便宜的。