What's the most cost-effective way to accept payments at trade shows?

Hi, attending my first trade show and need to accept payments at the cheapest cost. What would you suggest? Not sure how many I will have, 3-4 a year? Is there any benefit to a more expensive payment device over the cheapest when looking at very few Mobile pod being needed?

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I don’t know but I need this information too. What’s the best way to take a credit card payment at a show?