Here is my top 10 list.

1. Hi !

你好 = Nǐ Hǎo
MP3 => http://travelers-chinese-lessons.com/Ph ... Audio.html

2. Thank you.

谢谢 = Xiè Xiè
MP3 => http://travelers-chinese-lessons.com/Ph ... Audio.html

3. How much is this?

这个多少钱 = Zhè Gè Duō Shǎo Qián
MP3 => http://travelers-chinese-lessons.com/Ph ... Audio.html

4.Can you give me a discount? (make it cheaper)

再便宜点儿吧 = Zài Pián Yí Diǎnr Bɑ 
MP3 => http://travelers-chinese-lessons.com/Ph ... Audio.html

5.No, thanks. (don't want it)

不用了 = Bù Yòng Le 
MP3 => http://travelers-chinese-lessons.com/Ph ... Audio.html

6. I don't understand what you are saying.

我听不懂 = Wǒ Tīng Bù Dǒng
MP3 => http://travelers-chinese-lessons.com/Ph ... Audio.html

7.Do you speak English?

你说英语吗 = Nǐ Shuō Yīng Yǔ Mɑ 
MP3 => http://travelers-chinese-lessons.com/Ph ... Audio.html

8. Taxi ! (call a taxi)

打车 = Dǎ Chē
MP3 => http://travelers-chinese-lessons.com/Ta ... Audio.html

9.Excuse me. (making your way through the crowd )

借过 = Jiè Guò
MP3 => http://travelers-chinese-lessons.com/Ph ... Audio.html

10.You are beautiful!

你很美 = Nǐ Hěn Měi
MP3 => http://travelers-chinese-lessons.com/Gi ... Audio.html