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Amazon [amazon.com] has 2-Pack Master Lock 646T Luggage 3-Dial Combination Padlock (Black) for $ 3.75. Shipping is free w/ Prime or orders $ 25+.
Target [target.com] also has 2-Pack Master 646T Lock Luggage 3-Dial Combination Padlock (Black) for $ 3.75. Shipping is free w/ orders $ 35+.