As a delivery driver I can tell you first hand that when we see a $1 or $2 tip on an expensive order, some people (myself not included) will mess with your food. Yes, I mean eat it. With their bare hands. Either that, or they’ll take the longest route possible to your house while going under the speed limit.
I call lyft all the time as a single parent and offer lyft driver their pickup rate plus a 15-20$ tip to pick me up a 6 pack I choose. Usually 16oz buds, but it works and I don't mind the overpay for the convenience.
They can't spit in your food next time if you never come back :)
Obviously if the product is unused just return it to the store and buy it again. However, if the product is already in use, go to the store and buy a new product with the cheaper price. Then later come back with the product you just bought and return it, but this time using the old receipt with the higher price! In the end you'll have the same used product but with the cheaper price. I originally noticed this loophole when a customer pulled this trick while I was working as a cashier. Naturally this requires that you still have the old receipt.
I work in a gasstation, and I've learned that paying people back 40 cents or less in pieces of 5 cents and just telling them i'm low on change, made people just give the 5 cents back to me. It gives me 2 to 3 euro's extra per day atleast, which really adds up after a couple of weeks.I recycle the coins back in thé cash register and change them for bank notes, just so i'm also not stuck with a pile of tiny coins.And if i'm low on 5 cent pieces, I just tell it to my boss and he'll get more from the bank. As long as the amount of money in your register is correct, bosses don't care about the coins in there and how you give back your change.