Going infinite on gift cards
Shaw’s, among many other retailers, is offering a promotion where one can buy a $330 gift card at a cost of $300, or a multiple of those numbers, any number of times, the theory being that government economic stimulus payments are often in multiples of $300, and they’d rather you spend it at their store.
I suspect that their POS system would allow one to pay for a gift card using another gift card. Gift card is a method of payment, and the cashier likely doesn’t even see what kind of card you’re swiping to make payment. (They just enter in a $330 gift card activation with a $30 store discount.)