Postage
Chuck was a great one for not giving the government a extra penny if he could possibly avoid it. That particularly applied to postage. Of course, email has made big inroads on snail-mail, but there are always a few bills and some small packages that one has to send. We had (and I still have) a postal scale and we always bought a new roll of stamps when the first class postal rates went up. Chuck would scour every drawer in his desk looking for the right combination of stamps so he'd avoid overpayment. I discovered yesterday that I not only have a nearly-full roll of 44 cent stamps, I've got half-rolls of 23s, 37s, 39s, and 42s. I wouldn't give you odds that there aren't a few others around as well. Since we bought but never used the stamps, it looks to me like the Postal Service is well ahead on the deal.