I think that I will stick with cash, or food/water if we have enough, for trading materials. I have some reservations about trading ammo with someone who has an unloaded gun. Question one: Where did the first batch of bullets go? Question two: What is my security situation like if he starts loading up?

In response to the original posters question: 10 each of 20's, 10's 5's and 1's hidden in each vehicle and each BOB. One roll of quarters in each vehicle and each BOB. Plus usually $150-200 of "everyday cash" in various places (like my money clip).