I try to have $50-$100 in a drawer somewhere.
My DH travels ALOT for work and used to keep all his foreign currency stashed in a drawer at home. Rather than changing currency at terrible rates before returning, he always just kept leftovers on the theory he would go back eventually. A few years ago, we were burglarized and lost the equivalent of about a $2000 total. Ugh. That and my engagement ring were about the only things of value they found. A couple of beat up old laptops and harddrives, maybe, but their main value was the old photo stash.
He now keeps his currency stash in a safe at the office.