So.... I'm thinking of selling my 300mm to fund a 400mm on craigslist since I generally like testing the equipment I buy. I'm a little worried about the cash transaction part since we're dealing with 3500$ and 5500$. That's like 275 20dollar bills for a 400mm f2.8IS. How do you guys handle your large transactions? Would some safe places like police stations or banks allow you to sit inside and let you exchange the cash?