I haven't got a sou/sue/however it's spelt

There is a French expression "Je n'ai pas un sou" and I'm sure I've heard of this as an English phrase. My French teacher doesn't believe me so I could do with some support if anyone else has heard of the expression - any help on it's origin would be of help - presumably we nicked it from the French as it's old French money?

Thanks

I've heard of the phrase in English. I'm in the U.S. but I watch a lot of British TV imports. However, I couldn't find the expression in any of my reference books so far.

Just a guess:
Could it be "Mais je n'ai pas un sou"??

It sorta means "I dont even have a penny".

I hit the wrong key before I was finished.

Here in the US we have an expression "I/we/they dont have a pot to pee in".
maybe?