Yeah, we do. But it doesn't see a terribly large circulation, as the things most people would need a fifty to pay for you'd just use a debit/credit card on nowadays. I work as a cashier, and I'd say I see one maybe one every few weeks.
I see $50s and $100s daily at my job... and more of them around the 1st and 15th of the month, when so many people get paid...