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Wiktionary
give-away shop

n. A shop where people can bring and take goods without paying or getting paid.

Wikipedia
Give-away shop

Give-away shops, swap shops, freeshops, or free stores are stores where all goods are free. They are similar to charity shops, with mostly second-hand items—only everything is available at no cost. Whether it is a book, a piece of furniture, a garment or a household item, it is all freely given away, although some operate a one-in, one-out–type policy (swap shops).