I put value on every dollar I spend..It's just the way my brain works and teaching wife and kids the same thing.
We were just in Kaui and took a helicopter ride(not cheap) - $875 for a family of five. I got to place about 45 minutes before flight and gave my credit card to charge. She added 4% charge to use CC which I was not told when I made the booking. I refused to pay CC charge and she would not budge. This was very close to Kaui Airport so I went to ATM there but to my surprise it'll only dispense $300 max per day. I went to diff gates and diff ATMs but no way out. I had two ATMs(Fid with 0 withdrawal charge and BofA charged 9 bucks for withdrawal). Ran around and wasted 30 minutes but I was able to get only $600 and I had $175 cash with me..So I paid 775 cash and had no choice but to charge remaining $100 on CC. Cashier was amazed to see my efforts to save 4%($35) and waived that 4% charge on $100. She told me she had never ever seen anybody putting a value on every dollar the way I did. Most people will just shrug off or show their displeasure and hand in CC. My kids show what I did and hopefully learned something. I was happy to save $26 for half an hour effort which otherwise would have been spent waiting to take the flight.
Also when I buy water, I compare(same brand) no of bottles vs no of gallons of water and whichever is cheaper I buy...most of the times half liter bottles are cheaper than gallon of water..