There is a sticky thread at the top about fridge swaps. They are arranged by a volunteer and share a fridge for those staying at a value resort where fridges are not already in the room.
I was in a fridge swap and stroller swap last year with no problems. I believe the DIS rules on these have changed somewhat since then, as there is to be no money exchanged, (most Stroller swaps at the time had a small fee).
There also a few "Pay it Forward" boxes floating around where people can take what they want out of the box and add to it before they leave it for the next person. Search for "Pay it Forward" and you should find them.
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