The Daily Tightwad Tutor–Lesson #7: Stash Your Dollar Bills
This is sort of a new thing I’m doing, but it is classic idea for many frugal people. Whenever I see a dollar bill (in my husband’s wallet, in mine, etc.), I grab and stash it in an envelope in a drawer (that no one but myself knows about…critical point so no one else dips into it…). It’s a simple, quick way to save some petty cash. It’s kind of a surprise to find out how much you have even after a month! That’s what happened to us–I grabbed our envelope as we headed out to an amusement park. We had plenty of cash for the day and I didn’t have to go to the ATM.
BTW, I know some people do this with $5 bills. I wish, I wish, but I’m happy to do it with dollar bills!
~Marilyn, TFF
Two Frugal Fairfielders 
However, hands off the kids allowance
and you also wont have to raid their piggy bank for a tip for the delivery person