Includes- Breathalyzer, three additional mouthpieces and instruction manual. $19 + $3 shipping.
This is selling for $29.22 from Amazon. $29.22 is a record Low Amazon price. At $22 shipped, this seems to be a great deal. It's also worth mentioning that this seems to get good reviews at Amazon (4/5 stars).
BACtrack Keychain Breathalyzer - $19 (53% discount) + $3 shipping