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Give them something free in trade for contact details. Then you can contact them later with various offers and sell them whatever on the spot. Could be a small gift, coupon, tips to skip the dmv next time, lots of stuff...
Sell them services for a cell phone charger station, batteries, wifi access, healthy snacks, tip books, wellness products, diapers-wipes, female goods, and water. Really anything used in peoples daily lives now.
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