Make sure the cash you keep on hand isn't just large bills...
Set your self up like you're going to have a yard sale. Lots of twenties, fives, ones, and rolls of change.
Hundred dollar bills are great, but in a situation like the one many of us see, it's better to haggle for a price and be able to pay out on the spot without expecting them to have exact change!
Get Ready folks!
Yeah you need the change because if the power is out as well you will have to figure out the change or give them the exact amount.