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Remember that pricing on Amazon is subject to change at any time.
Amazon just dropped the price on the Advanced 3-in-1 Pepper Spray Keychain with Quick Release 2-Pack to under $13.25 ~ that's just $6.60 each! It has excellent reviews, and ships free with Amazon Prime or Free Super Saver Shipping.
You can also get this Personal Alarm Keychain (3 pk) for under $13, which is $4.33 each!