My suggestion: instead of facilitating exchanges as item for item, create a "green living dollar". Say someone wants to trade their gardening tools for something. Anyone can buy some green living dollars for say, 90 cents on the dollar. So customer A buys 20 GL dollars for $18 U.S., and gives them to customer B selling the tools. Customer B now has 20 GL dollars, and a greater incentive to keep using your site, as well as much greater freedom of selection than an item for item trade.
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