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Staples [staples.com] has 12-Pack Acco Binder Clips (Small) for $0.30. Store pickup (ship-to-store) is free.

Product Description from Staples[LIST][*]Acco binder clips, small, 3/4″ width, 5/16″ capacity, black/silver, feature an efficient triangular design that offers a powerful grip, yet releases easily. Removable handle folds down to simplify filing and storage or keep one handle up for a convenient hanger. Each binder clip is made of rust-resistant steel.