I do. For one of my jobs I get tips on top of my normal pay, so I keep my tips in an envelope in my bookcase. It comes in handy sometimes when my debit card is running low and I don't want to pull from my savings account.
I have some in my safe. Not a lot. maybe 2K or so. Most of my money is invested in different accounts. I do have a emergency fund set aside for any problems that might come up and need to get paid for right away.