B：I'd like to buy a toy car for my son.

　　A：How about this one?

　　B：It looks nice.How much is it?

　　A：They're three hundred dollars.

　　B：Oh, I'm afraid it's too expensive.Can you show me something cheaper?

　　A：OK,This one is one hundred and twenty.It's the cheapest here.

　　B：OK,I'll take it.Here's the money.

　　A：Thank you very much.