Another example (UK) if you buy gift cards at Morrisons (for many stores) you get a 1p/litre discount voucher for petrol for every £10 you spend, so for anything you were going to spend anyway at one of the many giftcard partners, you can giftcard it and save on fuel at Morrisons - doesn't seem to be any limit, so if you giftcarded a £500 spend, you'd save 50p/liter on petrol - so how much you actually save depends on how big & how empty your tank is.
PS. sure there must be some ebook tech/ebook suppliers in the partner list
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