BACtrack Keychain Breathalyzer $22
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Get this BACtrack Keychain Breathalyzer for $21.99 plus free shipping at Groupon Goods. This was the lowest price we found by around $8. Breathing into this 2-ounce keychain will let you know if you are over the legal limit to drive after having a drink. This device has been FDA cleared for personal use. The foldable mouthpiece tucks away when not in use. Sales tax is charged in most states.