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

[Onedayclothing]

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?

[JeffSchafer]

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