I mentioned getting cash back at supermarkets when using a Discover Card. By choosing cash back (also known as cash over) as a option during checkout, this works out as a nice interest-free loan. I pay off the card every month, and it saves me a trip to the ATM. I even said that I earn cashback on the cash back since it goes on my statement as being a purchase. Well, I guess that it couldn't last forever.
My last Discover Card statement had two supermarket transactions, that say "cashover $50". They now separate out the "cash over" part from the "purchases" part of the transaction. I am no longer earning a cashback bonus on the cash over amount. Oh well. At least it still saves me a trip to the ATM.
Again, I do not recommend this strategy to people who run a balance on their credit card, and end up paying interest charges on the cash over amount.