You can purchase $1, $2, and now $5 bills from the Bureau of Printing and Engraving on sheets. The sheets come in sizes of 4, 16, and 32 bills each. I buy such sheets of $2 bills. I carry large sheets, folded in my pocket, and sometimes pull out scissors and cut a few off to pay for something in a store. It's just for comedy, as the $2 bills cost nearly $3 each when purchased on sheets. They cost even more at coin stores.You can read more here, including how he presented a "Laser Safety Officer" homemade photo ID to a Secret Service agent who thought he was counterfeiting. =)
I take the sheets of 4 bills and have a printer, located through friends, gum them into pads, like stationery pads. The printer then perforates them between the bills, so that I can tear a bill or two away.
* for those of you who don't already know, "the Woz" is Steve Wozniak, principal inventor of the Apple ][ series of 8-bit computers. Steve Jobs was the biz guy for Apple, but the Woz was the weirdo and technical genius.