How Much Money Do You Keep in Your Wallet?

I use credit cards for any big purchases so I don't usually keep much cash in my wallet. Rarely do I have more than a few hundred dollars. This Boston.com article reports on a woman who found a lost wallet in a New Hampshire movie theater with $3000 of cash in it. She did the honorable thing and turned it into the police. The owner of the wallet did come forward. She was also a woman who was planning on making a car purchase.