What it means
Too expensive. 太 means "too" in the excessive sense, 了 marks the judgment as settled.
When to use it
Your opening move in a market negotiation. Say it with a smile and start walking — the price often follows you.
Examples
tài太guì贵le了，pián便yi宜yì一diǎn点ba吧。
Too expensive, give me a discount.
zhè这ge个tài太guì贵le了，wǒ我bú不yào要。
This is too expensive, I'll pass.
yǒu有diǎn点guì贵，néng能pián便yi宜ma吗？
It's a bit pricey, can you go lower?
The full set of survival phrases for greetings, dining, shopping, and getting around, each with audio.