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• rain check (wiktionary.org) - “a polite way to turn down an invitation, with the implication one is simply postponing it and that another time would be acceptable”
• penny wise, pound foolish (wiktionary.org) - Prudent and thrifty with small amounts of money, but wasteful with large amounts.
• five-finger discount (idioms.online) - shoplifting, stealing.
  • from https://www.barrons.com/articles/costco-membership-crackdown-stealing-afec29f6?mod=hp_columnists

    the term “stealing” is more often associated with using a five-finger discount on a product.