Customers with successful trades get a Best Buy gift certificate for their trade on the spot.

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You go online to Swellr and buy a gift certificate for a local store, say a restaurant, boutique or grocery store.

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It all started so innocently with one small gift of homemade cookies that your neighbors reciprocated with a very fancy bottle of wine, which made you want to buy something even nicer the next year to thank them for that bottle of wine, which they returned with a gift certificate for a swanky restaurant in town.

FORBES: Four Types Of Gift Giving That Will Leave You Broke