貨比三家不吃虧 [货－－－－－亏]

Jyutping fo3 bei2 saam1 gaa1 bat1 hek3 kwai1
Pinyin huò bǐ sān jiā bù chī kuī

Definitions (CC-CEDICT)
  1. shop around first and you won't get ripped off (idiom)
Definitions (Wiktionary)
  1. proverb
    if you compare the price of something at three different locations, you'll never be ripped off