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You can use your Costco membership to get a travel vaccine—and it saved me more than $100

Heading overseas and need a travel vaccine? Head to Costco.
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15 tactics Costco uses to get you to spend more

Costco is known for bulk purchases and special deals, but they use tactics you may not know about to get customers to spend more money. Understanding these tactics is one of the best Costco hacks to ...