Stock up for Halloween when you stop in your local Costco warehouse. This 30-pack of Mars candy bars regularly costs $19.99, but now through Oct. 19, Costco members score $4 Instant Savings. That makes your total only $15.99, or $0.53 per candy bar.
Not sure if the candy will be a hit? Try it out risk-free. Costco will let you return almost anything (yes to food, no to toilet paper). Be a Costco return policy expert.
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